When joining a new server, sometimes every attachment except the bullets/mags of the primary type weapons dissapear from the weapon and from inventory, for example: You had a mosin with a Ghillie Gun Wrap and a long range scope, and it's loaded and a PU scope in your inventory. You join a new server, the mosin has only the bullets, without the gun wrap and both scopes are gone, leaving you two empty slots in the inventory.