Deselect the In ‘No Transpose’ Instrument Channel Strips option in the File > Project Settings > MIDI > Chase pane.
These settings prevent your sampler’s drum loops from playing until they reach the next trigger note, whenever the project jumps to a new position.
The No Transpose parameter actually prevents transposition by the region playback parameters, which is also not desirable for drum sounds or loops.
Download the guides:
Logic Pro User Guide: PDF
Logic Pro Effects: PDF