The side inputs, which disable the latch, will incorrectly be activated by a locked and disabled repeater. Closer inspection reveals they activate when any adjacent block has power pointed at it. This explains the repeater bug, and also allows the latch to be de-activated by air with redstone pointed at it.

Attached is a showcase of said mechanics.

In addition to the previous oddity, I was attempting to make a diode using half slabs and encountered another instance of strange behavior. Attached is a simple showcase.

This issue has been addressed in 0.2.2a. Thanks for the report and feel free to re-open if need be.