highlighting two columns with one click

[Dave Feustel <dfeustel verizon net>]

Is there anything I could have done that would cause
gnumeric to highlight two adjacent columns when I click
on one of the column headers? (eg. clicking on col C highlights
both B & C. Ditto for any other column pair as well.

This suddenly happens on sheet 1 but not on sheets 2 or 3
of the spreadsheet.

Thanks,
Dave Feustel