Might not be Chris. Quite often, I find that the page, and the position on it, might be random, regardless.For example, if the last page in a thread I have looked at was Page 3, and the newest, and the one I select, is Page 4, it might skip to part way through Page 4, not the top.
I also experience a 'double sized' page occassionally, where I have to wait until it 'pops back' to normal screen size.