When you have 2 weapons, one on your back and another on your hand, after eat something is impossible to use your hand or weapon again.
Is impossible to drop the weapon on ground or put something on hands.
The weapon is on your hand but is invisible and is not possible to use or drop.
( sometimes works fine and others the bug appears )
The solution to fix this issue..
Log-off and Log-in again on server.. then your weapon will appear on your hands again and you can use it normally.