Although I'm not sure how exactly to replicate it as it appears to happen at random, sometimes when the player is either standing on the physics object (both flower and cube done this), the player appears to fly into the air and then fall back down.
A possible fix could be making the player and the object colliders overlap each other so the player can pick up an object but not push it, meaning the object cant appear to make the player fly.
Although I'm not sure how exactly to replicate it as it appears to happen at random, sometimes when the player is either standing on the physics object (both flower and cube done this), the player appears to fly into the air and then fall back down.
A possible fix could be making the player and the object colliders overlap each other so the player can pick up an object but not push it, meaning the object cant appear to make the player fly.