AlliedModders - fps_overide 1 Issue

Hi, I´m having some issues regarding fps_overide. If I turn it on (1) game doesn´t seem to fluid. sometimes movement is ok other times is slow, even when I through a grenade I cannot see the nade clearly, for example from point A to B, it appears and disappears.
As soon as I turn fps_override to 0 no more issues. Strange thing is that doesnt happen in all Servers. Is there any possiblity that fps_override is incompatible with some servers because of some plugins, modules or something else?
Thanks in advance.

Edit:After searching a bit more, I guess hl engine has some limitations, running the game above 100 FPS will bring you some issues, however I still wonder why on some Servers I have no problem at all.