Physical properties being affected in Fretta?

I am having an issue on the server I am trying to run Fretta on, what we believe is: after a certain gamemode (still unknown but potentially UCH) properties of props become ruined and they all seem to go no-clodided and have very low gravity. A simple map/gamemode-change does not resolve the issue and a whole server-restart is needed to remedy it when the effect is spotted.

Does anyone have a clue, what could be causing this and how to resolve it?