Neil, Stick, and Dmitriy already explained what is going on. This is an excellent illustration of O'Hagan's rule in action. Any 6 by blue is a market loser, while there are two anti jockers in 44 and 33. The difference is 9  just enough for a double. Actually, you also need to look how the remaining rolls play to make sure you at least "break even" in those. We have two bad rolls that bury our spares deep  54 and 53  and three good rolls that don't break the prime  31, 21, and 11. So, we are doing OK on average in the nonjocker rolls and can double.
  White is Player 2
score: 0 pip: 103  Unlimited Game Jacoby Beaver  pip: 108 score: 0
Blue is Player 1  
XGID=bBBBBCBcccbbB:0:0:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No double  Double/Take 
Player Winning Chances:  61.08% (G:12.58% B:0.46%)  61.40% (G:12.45% B:0.51%) 
Opponent Winning Chances:  38.92% (G:8.61% B:0.34%)  38.60% (G:8.77% B:0.36%) 
Cubeless Equities  +0.262  +0.533 
Cubeful Equities 
No double:  +0.253 (0.019)  ±0.004 (+0.250..+0.257) 
Double/Take:  +0.272  ±0.006 (+0.266..+0.279) 
Double/Pass:  +1.000 (+0.728) 

Best Cube action: Double / Take 
Rollout details 
2592 Games rolled with Variance Reduction. Dice Seed: 1405227 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 24 minutes 44 seconds 
eXtreme Gammon Version: 2.10
Move our spare to the 5pt and instead of three good nonescaping rolls we are left with only one  21. We still have 54 and 53 and hence the nonjocker rolls are not quite in our favor. We are just short of a double.
  White is Player 2
score: 0 pip: 103  Unlimited Game Jacoby Beaver  pip: 107 score: 0
Blue is Player 1  
XGID=bBBBCBBcccbbB:0:0:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No double  Double/Take 
Player Winning Chances:  59.29% (G:12.14% B:0.44%)  59.43% (G:12.05% B:0.44%) 
Opponent Winning Chances:  40.71% (G:9.00% B:0.34%)  40.57% (G:9.21% B:0.36%) 
Cubeless Equities  +0.218  +0.436 
Cubeful Equities 
No double:  +0.183  ±0.006 (+0.177..+0.189) 
Double/Take:  +0.135 (0.048)  ±0.010 (+0.125..+0.145) 
Double/Pass:  +1.000 (+0.817) 

Best Cube action: No double / Take 
Percentage of wrong pass needed to make the double decision right: 5.2% 
Rollout details 
1296 Games rolled with Variance Reduction. Dice Seed: 15529142 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 13 minutes 08 seconds 
eXtreme Gammon Version: 2.10
Naturally, with such a marginal double in the OP it's not a redouble.
  White is Player 2
score: 0 pip: 103  Unlimited Game Jacoby Beaver  pip: 108 score: 0
Blue is Player 1  
XGID=bBBBBCBcccbbB:1:1:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No redouble  Redouble/Take 
Player Winning Chances:  60.90% (G:12.96% B:0.48%)  61.44% (G:12.57% B:0.48%) 
Opponent Winning Chances:  39.10% (G:8.75% B:0.36%)  38.56% (G:8.74% B:0.35%) 
Cubeless Equities  +0.261  +0.537 
Cubeful Equities 
No redouble:  +0.404  ±0.004 (+0.400..+0.408) 
Redouble/Take:  +0.275 (0.129)  ±0.009 (+0.266..+0.285) 
Redouble/Pass:  +1.000 (+0.596) 

Best Cube action: No redouble / Take 
Percentage of wrong pass needed to make the double decision right: 15.1% 
Rollout details 
1296 Games rolled with Variance Reduction. Dice Seed: 15529142 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 19 minutes 54 seconds 
eXtreme Gammon Version: 2.10
If we have more pips to spare before breaking our full prime, white will find it difficult to take.
  White is Player 2
score: 0 pip: 103  Unlimited Game Jacoby Beaver  pip: 115 score: 0
Blue is Player 1  
XGID=bBBBBBBAcccbbB:0:0:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No double  Double/Take 
Player Winning Chances:  73.19% (G:14.95% B:0.57%)  73.32% (G:15.18% B:0.60%) 
Opponent Winning Chances:  26.81% (G:5.24% B:0.24%)  26.68% (G:5.26% B:0.22%) 
Cubeless Equities  +0.564  +1.139 
Cubeful Equities 
No double:  +0.663 (0.287)  ±0.007 (+0.656..+0.670) 
Double/Take:  +0.950  ±0.009 (+0.941..+0.959) 
Double/Pass:  +1.000 (+0.050) 

Best Cube action: Double / Take 
Rollout details 
1296 Games rolled with Variance Reduction. Dice Seed: 15529142 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 13 minutes 34 seconds 
eXtreme Gammon Version: 2.10
  White is Player 2
score: 0 pip: 103  Unlimited Game Jacoby Beaver  pip: 116 score: 0
Blue is Player 1  
XGID=bBBBBBBAcccbbB:0:0:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No double  Double/Take 
Player Winning Chances:  74.97% (G:15.73% B:0.63%)  75.22% (G:15.75% B:0.68%) 
Opponent Winning Chances:  25.03% (G:4.69% B:0.21%)  24.78% (G:4.70% B:0.20%) 
Cubeless Equities  +0.614  +1.239 
Cubeful Equities 
No double:  +0.731 (0.269)  ±0.006 (+0.725..+0.737) 
Double/Take:  +1.064 (+0.064)  ±0.008 (+1.056..+1.072) 
Double/Pass:  +1.000 

Best Cube action: Double / Pass 
Rollout details 
1296 Games rolled with Variance Reduction. Dice Seed: 15529142 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 13 minutes 42 seconds 
eXtreme Gammon Version: 2.10
Finally, here is the position from Backgammon Boot Camp that Tim mentioned. Due to deeper white spares placement we don't really have bad nonjocker rolls that place our spares into worse spots than white's. It is a very strong double now
  White is Player 2
score: 0 pip: 97  Unlimited Game Jacoby Beaver  pip: 108 score: 0
Blue is Player 1  
XGID=bBBBBCBbbcccB:0:0:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No double  Double/Take 
Player Winning Chances:  69.99% (G:15.47% B:0.60%)  70.13% (G:15.78% B:0.65%) 
Opponent Winning Chances:  30.01% (G:5.49% B:0.21%)  29.87% (G:5.58% B:0.20%) 
Cubeless Equities  +0.504  +1.018 
Cubeful Equities 
No double:  +0.564 (0.241)  ±0.005 (+0.559..+0.569) 
Double/Take:  +0.805  ±0.009 (+0.796..+0.815) 
Double/Pass:  +1.000 (+0.195) 

Best Cube action: Double / Take 
Rollout details 
1296 Games rolled with Variance Reduction. Dice Seed: 16811921 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 11 minutes 15 seconds 
eXtreme Gammon Version: 2.10
as well as a redouble
  White is Player 2
score: 0 pip: 97  Unlimited Game Jacoby Beaver  pip: 108 score: 0
Blue is Player 1  
XGID=bBBBBCBbbcccB:1:1:1:00:0:0:3:0:10 
Blue on roll, cube action? 
Analyzed in Rollout  No redouble  Redouble/Take 
Player Winning Chances:  69.65% (G:16.10% B:0.65%)  70.13% (G:15.78% B:0.65%) 
Opponent Winning Chances:  30.35% (G:5.62% B:0.22%)  29.87% (G:5.58% B:0.20%) 
Cubeless Equities  +0.502  +1.018 
Cubeful Equities 
No redouble:  +0.676 (0.129)  ±0.005 (+0.671..+0.681) 
Redouble/Take:  +0.805  ±0.009 (+0.796..+0.815) 
Redouble/Pass:  +1.000 (+0.195) 

Best Cube action: Redouble / Take 
Rollout details 
1296 Games rolled with Variance Reduction. Dice Seed: 16811921 Moves: 4ply, cube decisions: XG Roller+


Double Decision confidence:  100.0% 
Take Decision confidence:  100.0% 
Duration: 18 minutes 42 seconds 
eXtreme Gammon Version: 2.10