Forum:Scopes disappearing?

When my brother and I have been playing, we've encountered an odd bug; some weapons, generally pistols but some sub-machine guns, even when it states that a weapon has a zoom, there's no scope and you simply aim down the sights without magnification. This most commonly happened on the Lady Finger, but it's happened on some randomly-dropped and randomly-generated buys from the weapon store?

Has this happened to anyone else? Any suggestions for fixing it? We're playing on PC as of now.