The Player's inventory wont show, how do I fix this?

In my One block lucky block game, you can get guns and stuff to fight sentries that are spawned by the lucky block, but the inventory doesn’t appear to select weapons! How do I fix this?

What do you mean by that? It’s a little unclear. Could you add a picture?

you have to select the weapons yourself…
If they dont show up, check your item slots in the map options.