After this new update 13.3.18 I have the same glitch there was at launch except I can't join in at all. Please Sledgehammer could you do smethsome about this?
Just like Deek1ty mentioned, removing the m1941 rifle and Battlewatch II variant from your custom classes should fix the issue while we are investigating the issue. However, if you don't have that weapon equipped to any of your classes and you are still getting this issue then please reach out to let us know. Thanks.