Replying to When reading threads

when im reading threads this really wierd thing happens when i get maybe about 10 or so posts down. everything goesw to the left of my screen like into the online list and then the text is below the name and pic instead of next to it. and also just a random thing to note, on the right banner ad in the last thread i was reading all that showed up was a post by eheath that said "this thread's mainframe is collapsing" ill get pics if someone tells me how to take a screenshot.