Microsoft Graph in Word 97

Hello,
I have this strange problem that I've never seen before.
A user created a graph in Excel 97 with the built-in Microsoft Graph editor.
She copied the graph and pasted it as an object in a Word 97 document. As soon as the double-click the graph to edit it in Word, the titles of the columns completly change. Her graph is basic, one column per month, but when she double-clicks the graph, the columns' title change e.g. : Oct 2002 -> Sep 98, or Nov 2002 -> Dec 98.
She has W2K SP3 + Off97 Sr2b; Office has already been uninstalled and reinstalled properly.
Any good idea is welcome :-)
Cheerio