Flans mod Item duplication

Greetings! I’ve recently been trying to start a flans mod factions server as I used to play flans mod factions ALOT about 4 years ago and ive wanted to get back into it. Anyway, the only thing currently keeping me from opening it is an issue with item duplication, for some reason when sponge forge is installed then dropping a flans mod gun results in it staying in your inventory and it also being dropped. The strange thing is that it only happens with guns. Vehicles and Ammo dont seem to be affected.
Thank you for any support

Here, this was posted because of another Forum with the same issue.
Try this: