Compact Machines version: Not sure, the one that's in the Enigmatica modpack v.1.6.0
Forge version: 14.23.5.2796
I am not using Optifine: yes
Screenshot (if possible): here

The video above tells everything, Items keep dropping after crafting. After re-joining the server the dropping stops.

This was merely a client-server sync issue and will be fixed in the next release.

If you need this fix sooner you can grab a current build from here, but be aware that these are unreleased preview builds.