Tradeskill combine problems are generally database issues. If you are playing on a public server, you should report it on the message board for that particular server.
You mention Classic EQ, which to me suggests you may be playing on P1999, their forums are here:
http://www.project1999.org/forums/index.php
If you are running your own server, using the PEQ database, then report it on the PEQ forums:
http://www.peqtgc.com/phpBB2/viewforum.php?f=16