Forum Discussion
I have experienced this issue as well, although I have found that it can also happen on DMRs and with the 4x scope from my experience, and without a bipod (or indeed any attachments other then the scope). For me, I have noticed it seems to happen when I ADS with a primary with a scope (4x, 6x, 8x) directly after switching from a secondary or launcher that has iron sights or a low power scope on it.
As mentioned above, if I have the bug happen, I have found that switching to another sight in the plus menu, ADSing with that sight, then switching back over to the higher power scope generally fixes the problem, though only temporarily. I have had this happen multiple times with-in the same match, and even multiple times with-in the same life. I hope this gets fixed sooner rather then later.
I'm playing on PC btw.