HELP!! I'm confuzzled.

I just got put in charge of my club membership roster. The columns in Excel
are correct, yet when I put them in the merge, instead of getting a month and
year in the "expires" spot of the merge, the program uses the "year" as a
date, and adds the year the person was originally added to the list. I can't
seem to figure out how to correct this no matter what format function I use.

The mail merge fields look like this: First Name, Last Name, expires on the
first line, then address with city state and zip, and then the postal
whatever it's called on the bottom.

The label should look like this:

John Smith Mar 05
1234 Elm Lane
Anaheim, CA 92804
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and instead look like this:

John Smith Mar 05/2003
1234 Elm Lane
Anaheim, CA 92804
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How can I fix this problem without having to individually edit each label??
There are 800 members in the club!!!!!!!!!!

Thank you!!