Weird bloom problem

[Chaku01]

I play in 1280*800. I tried in 800*600 and the problem persists. Btw, I can't play with a lower shader, lowest and low crashes the game, medium completely changes the textures, they become very, very bright and no lightning effect is visible. I remember reading a post with someone who had a similar issue, but I didn't look too much into it because anyways, I play the game with the highest shader and it works reasonably well.