Here is a link to someone else having the exact issue, but a resolution wasn’t provided. It seems to only be happening when transitioning from the default third person anims to the animation starter pack anims. For example, when going from idle/walk/run (no weapon) to jump it transitions fine…but when going from ‘jog_holding_ar’ to jump, the character sinks into the ground for a second. The amount of sinking that occurs makes the character sink to just above the ankle.