Clearly, "qw appears somewhere in the sheet! I would guess to the right of
your print range, there is a cell, possibly right aligned, with qw, followed
by several space characters. You would then notice that the vertical borders
of the adjacent cells do not show. It could also be to the left of course,
having qw preceded by spaces, or possibly indented. Again, you would notice
that the vertical borders to the left will then not show. Why not press
<Ctrl><F>, type in qw, and click on find?