I have picked up a couple of quirky behaviours with a grid that is wide enough to have horizontal scrollbars.

i) if the grid is scrolled to the right, and then you sort on a column, the grid headers become misaligned with the body rows - the body rows snap back to full left scroll, whereas the headers stay in their scrolled position, at least until you scroll again;
ii) if the grid is scrolled to the right, and you select a row, both body and headers snap back to full left scroll.