Double printing on Epson dx5000 using Excel?

When printing from an excel spreadsheet, the last 2 columns are coming out double printed but not every single time. Tried alignment facility, reloading the printer driver, reloading excel, copying and pasting work onto a new sheet, then printing - all with very limited or no success. Seems ok printing from word and pages from the internet which leads me to believe it might be an excel problem rather than the printer but i'm no expert, hence my question here! Thanks