I logged out in a tree while having an AK74 on my shoulder and and one in my hands.

When I logged back in, I still had the gun in my hands but the gun on my shoulder had disappeared.

Happened later again with a repeater on my shoulder and sporter in my hands on a different character. Dropped the repeater before climbing a deer stand. Shouldered the sporter then climbed the ladder. Came back down, picked up the repeater and put it back on my shoulder. After running for a few minutes, the repeater on my back vanished.