Drum Pattern not being followed

I have Cubase 14 Artist, and I recently started playing with Patterns. I have a recurrent issue where my drum patterns start getting randomized out of nowhere. I’ve checked the randomization settings and the drum parameters – they look alright. Even on a simple 4/4 with a kick drum on 1 and 9 (16-step pattern), I start getting this random kick drums inadvertently, at different beats.