Please dont post such comments in other topics. Even when stating that it is off topic. Cause then it draws all the attention away from the original topic and to this new item.
To answer, we cant tell you. cause just saying you see scroll bars gives us nothing.
What Browser? What Topics? Is it a constant thing or when you refresh do they go away? Is it the same members? Is it different members? Does the length of the post matter?
It could very easily just be a browser glitch. I seen it once before myself, but a refresh of the page and it was gone. I didnt think nothing of it cause i am using a Beta Browser on top of it.