Greetings!
There may be a few reasons why this is occurring, including the type of container used in the combines. Please take note of the Tradeskills section of the wiki -
https://wiki.project1999.com/Tradeskills.
Please note: The Project 1999 Wiki is not maintained by Project 1999 staff and may contain inaccuracies between the emulator server, forums, live EverQuest, and reality. As always, player insight may be the most invaluable tool in your arsenal. After exhausting the pathways above, and you are continuing to experience issues, please do not hesitate to let us know.