Not sure whats going on with the 'difficulty' for my workers...

I have a Block Errupter cube that when I run it on BTC Guild i set the difficulty to 32 as it runs around 32GH and it runs smoothly.

With this script, for some reason, the difficulty for my client slowly gets jacked up and up until its over 200 instead of staying at 32 as it should ?

ie output from BFGminer... here with client difficulty already at 189... it slowly goes up and up...

 [2014-04-06 19:38:08] Accepted 004d77fc PXY 0  Diff 845/189
 [2014-04-06 19:38:26] Accepted 00ba8854 PXY 0  Diff 351/189
 [2014-04-06 19:38:39] Stratum from pool 0 requested work update
 [2014-04-06 19:38:43] Accepted 014f4088 PXY 0  Diff 195/189
 [2014-04-06 19:39:32] Accepted 0131220c PXY 0  Diff 214/189
 [2014-04-06 19:39:32] Accepted 000a4695 PXY 0  Diff 6.38k/189
 [2014-04-06 19:39:39] Accepted 002a120c PXY 0  Diff 1.56k/189
 [2014-04-06 19:39:39] Stratum from pool 0 requested work update

does this translate into my miners taking difficulties they can never work on ? what should I do here ?