Character crouching makes physics freak out


I’m trying to figure out some issues to a problem I’ve been having. I want to have stackable crates the player can climb on and so forth. The only issue is if the player jumps on them and croucheds while they’re still settling it has this crazy adverse affect where it applies a huge amount of pressure and just makes the objects go absolutely crazy.

This gif probably explains it best:

Is there a solution to this problem?