Connecting to a experimental server first and then back to the same public server (3664209) fixed my character.

steamID STEAM_0:1:3966786
steamID3 [U:1:7933573]
steamID64 76561197968199301

I had the same issue happen. Logged off on one server (waited for the 15sec timer), joined another and my AKM suppressor, full magazine and batteries that were in my optics were gone. Also the gun glitched out and thought it still had a magazine when it did not, I had to toss the whole thing and get a new one.