this is looks like an error I encounter few days ago and justin said it was capsule collider reposition bug and send a fix via email. here is the fix, you can try if it solves your problem too
Hello, I noticed this bug too. here simple explanation with video.
if you grab a rifle and look down before firing you can see your legs, but if you fire too much the camera view get tilted and you can not look down to see your legs.
video explanation