Clutching at straws, but a few more things I'd look at:
- what's the pulse duration (On param) of the Multi-Cick that feeds the input? e.g. I've had issue before where the default 1s pulse from edge detection is (sometime) long enough to trigger the 1s "long press" detection on a T5 input
- Try recording the moods in the mood edit dialog. T5/3 is the "odd one out" by being last in the list and maybe that's relevant
But +1 definitely create a second simple Lighting Controller, feed the same memory flag into that and confirm if it has the same issue. This should give a clue if it's an issue in the way the pulse is being generated, or in that specific LC.
Also, try making another multi click (or other logic block) fed from a new VI, and feed into a different T5 input on the same LC and see if that recreates it.
Good luck!