Hmm, this can be possible... Maybe if someone gets stuck inside a prop, this happens. Other causes might be, that the objects have no-collide (like no collision, means float through walls) and grav is set to 0 for those props. I can't help it, but can guess what's going on...

Yeah that happening for a server i used 2 play on ITs relly fuckt up (sorry for my way 2 talk im not so good 2 english)

Yeah. I have tryed that many times. Ok not so many times agian about 5-6 times. Mostly not playing servers whit props and objects. Sometimes its funny i think  . I once tryed make a barricade  . If they didnt shot or knifed it or ran into it it would hold. I think on sometimes how it would be in zombie mod. Flying sofas, veding machines, book case all that stuff. Could look funny but be bad.