Player going trough mash when standing on movable mash

My character is slowly sinking trough the movable mash (elevator). Very noticeable on mobile and a little bit on PC. I try to set it up Make Complex simple and the other way around but characters feet are still going trough the mash when going up. It very noticeable with when elevator picks up speed. I her of these computing error. How ever no one seems to be able to crack these one. No info on these anywhere. Can any one teach these noob a lesson.?