Odd lines in Excel 2003
 

Can someone tell me where some lines are coming from in Excel 2003?
When I go to do something simple like select a range of cells, I end up
selecting lines (boxes?). They appear to duplicate parts of the
gridlines, as if another object was sitting there. It's extremely
annoying, and seems to be new to this version. Once I delete a few of
them, I can finally get to selecting a range without having to deal
with these lines getting in the way. Help. Can I make it stop?