Items getting blocked

Allowed items gets randomly blocked. Reload of plugin fixes it?
 

In most cases it's caused by other plugin cancelling CustomMixing behaviour.
CustomMixing just allows placing everything in mixing table, while other plugin can block it.
Reloading plugin just updates the mixing table and reverts changes what other plugin did.
Check if some other plugin like ganja or any plugin related to custom crafting in mixing table doesn't do that.

The only one I got that is affecing the Mixing table is the Ganja plugin, and yes it seems like that's it 
 

Wrote to the Ganja plugin creator how to prevent that, i think it could be simple solution.