Having trouble with Aastra XML script and EPM

Beta Program Issues
1

We’re having a little problem with an XML script we use on our Aastra phones. When we program a button with the following in EPM:
http://172.yada.yada/aastra/directory/csv_nmu_directory.php?source=NMU

After we hit save, we have:

http://172.yada.yada/aastra/directory/csv_nmu_directory.phpsou

For some reason, when we hit save, we lose a ? and rce=NMU

Any ideas?