Good morning buzz. 

The plugin does not recheck for a free inventory slot after giving the player the announcement of removing an item for free space. i have confirmed it as well for 3 others on the server. 

Anything I missed out during the installation? or is this a well-known bug but not able to solve yet? Please let me know.

Cheers and a happy week ahead!

I just added this to my server and I noticed the same issue.