Server bug, props can't stop jumping withouth server restart

[JackBauer]

I don't know why this happened but my clan server bugged and all props are jumping when they touch the ground and we can only fix that by restarting the server, i would like to know the reason for that bug and how to fix it withouth restarting server, when i use create server in the counter strike menu and that bug happens I can only fix it by restarting the game and creating a new server again, only a server restart doesn't work when using a non-dedicated server.
Anybody knows the reason for that bug? thank you
Pictures of what happens(i know the time is out of order, but it happens like that, it goes from the floor to the sky, and do it again, and again....):