The mouse click is disabled while in the stand in order to monitor your clicks and prevent you from adding more than one of any type of item.
Something is preventing it from being reset. Something I missed obviously.
You're using the Modders Resource package......I think the scripts from the playable version may have been updated once more than the modders resource. I had a bad time for a while there and ended up dropping it a bit early, I think.
The whole thing needs to be rebuilt again, but if you compare the scripts from the playable version of the mod with the ones from the modders version you might be able to spot the difference. Otherwise, I'll have to offer my apologies and try to get working on it as soon as I am able to.