lights are acting wierd and shadows are glitched

[JTeslaCoil]

I compiled the deferred shaders propperly, compiled the game (both sp(my own fixed version) and mp), and moved everything into the mod folder, yet whenever I run the game and enter my devtest map, the shadows are bugged, constantly disapearing randomly, and very low resolution. I have linked an image, if you have any advice as to how to fix this, please let me know.