Hi,
Sounds like the spreadsheet resolution is changing and hiding/ displaying
the wrong data?
Excel info cut off or cropped when pasted into PowerPoint
http://www.pptfaq.com/FAQ00068.htm
Does the above link help? Else, it might be something else.

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Regards,
Glen Millar
Microsoft PPT MVP
Tutorials and PowerPoint animations at
the original www.pptworkbench.com
glen at pptworkbench dot com
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>I am trying to edit data withing an excel table which appears in a
> presentation slide. After I make the changes, two columns on the right
[quoted text clipped - 5 lines]
> Thank you very much.
> -Hilary