Line/light glitch issue

Hey all,
On most of the maps, with the exception of gm_flatgrass and gm_construct, there have been these ‘lines’ appearing on most of my maps.
At first I thought it was a graphic issue, so I changed all the graphics settings to low, but it did not work. Then I realised that the lines change with the fog and light colour, even with the glowsticks weapon addon. They also randomly appear and disappear when you move.

Anyone else have this problem? or know how to fix it?
Thank you! <3