Hi,
Toribash forums aren't supposed to act like that. Nothing serious, a simple cache clean will get it working nice and clean again. Although I may or may not be correct, that specific picture is structured so where the black ends, the rest of the picture continues, like such:
It uses a little glitch where the background is supposed to be black (I could be wrong)
Seems like your browser doesn't want to load it correctly but as foxy said previously, a cache clean should set it straight. What browser are you using? It reminds me of edge