"Undo" creates bizarre behaviour
 

hello,
I have a workbook with multiple sheets with comboboxes.
On sheet1 I have a combobox linked to a named cell in A6, on sheet2 another
combobox linked to a named cell in A10.
The names of the cells are not shared between sheets.
On certain sheets, when I click undo, I found that it writes the content of
sheet1 A6 and sheet2 A10 on the active sheet.
Has anybody experienced this in the past?
Any help most welcome.
thanks

--
caroline