Mesh Collider Not Colliding Properly and Networking Object Transforms With PUN

Im having two problems with my game currently first is this mesh collider. I made a mesh in fusion 360, uploaded it to unity as a .fbx file, and just after I attatched the mesh colliders for it, the video i linked shows what happens, because i dont know how to describe it myself (Note: i also made the bread dudes in fusion 360 so i dont know why they arent glitching too, I have no other scripts influencing behavior that would make it act like this). And along with this, I featured a grabbing mechanic in my Unity video below, which I am trying to implement so that all players across the PUN network can see when it has been moved by someone else, yet all solutions that I have found seem to use RPC's, which are now obsolete, Transfering ownership, which I am unable to do in my situation, or to instantiate the object over the network, which I do not want to do as my bread characters are scene objects and not really network objects, and since I plan to have many more, instantiating that much would be a real pain. So, if you can answer either question that would be very much appreciated, I can link files to specific things if you wonder how my game is set up, and any help is great! Thanks! =)

EDIT: Since I want to give you guys more context, I've been looking into ways to upload my unity project to a forum without sending each script and all. But untill I've figured out how to do that, for my multiplayer PUN setup im going partially ff of this tutorial on youtube:

hope that helps! =)

 

I hate to bump a thread, but nothing has really progessed from here since a solution to this problem would allow for me to finish my other tasks which are all dependent on me finding the solving this problem yet I cant seem to find a solution sadly...