There is no 1/4 bar SUB OSCILlATOR SYNC Speed. It go from 1/2 to 1/8 no matter which Sync mode.
The speed label tell the correct speed like 1/4 bar, but the speed is'nt correct. It's in all Sync modes the speed for 1/4 to 1/32 bars is to fast.
Look like a bug.