Issues with Child Bed

I am having a small issue with this children's bed I have made. It seems to work perfectly fine unless an adult gets into the bed. I have attached the package file and a video in the google drive link. If kids get into the bed it seems fine. If adults sleep in the bed they get out and T pose and if I tell them to go back to sleep they can get in just fine. This can be seen in the video. Not sure whats going on. I seperated the mattress from the EA mesh and then built the frame around it. 


drive.google.com/drive/folders/11YKT6b1ureJmMFK2Yihr5fSWimLIjUm4?usp=sharing