R15 Rig randomly falls into floor

I have NPCs that are supposed so spawn on a part, then follow the pre built path using MoveTo,
the issue is that they will very rarely (but still enough for me to have experienced it while testing) glitch into the floor and play a falling animation. It’s not a hipheight (to my knowledge) issue because I’ve tried printing the NPCs hipheight when it spawns, and it always prints the same number, 2. I have my spawn set high up so I don’t believe they’re spawning in the floor. I can’t think of what the issue may be. Could it possibly have to do with me changing the collision group of the NPC when it spawns?

Also, the bug only happens when I test the game on Roblox, not in studio + the NPCs are just R15 models.

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