I've been getting something similar to this. It appears to happen only at the start of the round, when I first load in. When I put the gas mask on I get two floating rear sights (Or partial edges of the mask? Can't tell) Appearing in the middle of the screen. If I wait a small amount of time it seems to resolve itself.
Related, weapons, head models etc sometimes do not load in early in the round. Typically this resolves itself before the round starts.