I created 2 simple text objects and exported to Excel and I do not see a problem. What version of Crystal? I used 10 for the test, but I also have 11 and 8.5.
Sometimes it just best to delete the incorrect field and re-add it to the report. Also if it is text, delete the bad one, copy the other and paste, and then edit the text value. Now you know they should be defined the same.