I’m sure it’s not random and it occurs due to a reason but, I’m unaware of the reason (and will keep an eye out). So far it only occurs while I’m in Borderless Window mode. When it occurs a ‘quick-fix’ is having to hit escape- go to video options- and change to either full screen or windowed and back to borderless window. Unfortunately, at the moment, there’s a chance of crashing to desktop while switching in between the different modes. This might happen several times throughout the map. It also has the chance of fixing itself.
While in a mission portions of the party frames appear to shift downwards leaving only one player at the top of the party visible at the very bottom of the screen. Everyone else in the party is shifted below the window making it impossible to see MY/YOUR character’s health bar.