CanCollide is set to true. Anchored parts that collide with my character's parts are passable. Unanchoring them fixes this as well as switching to the default character or any of the models in the RigBuilder. When I jump with the character the parts are also not passable. Any suggestions on how to fix this?
Edit: Solved my own problem. No clue why, but when I set the RigType of the Humanoid from R6 to R15, the bug stopped. Weird.

2 comments
Maybe there is something wrong in the custom character.
Most likely. Does my model have to have legs or be a certain size since when I've made models that are are upright and have legs it doesn't happen?