Just now during some PvP against the family both myself, and a couple other squadmates were experiencing an issue preventing us from firing.
As far as any of us could tell most of the time there wasn't anything that seemed like it would cause this, and in no other situation have I found it possible to target an enemy but impossible to hit like this. At some points it did look like the enemy wasn't firing when they should have too, so it may have affected them as well.
If the situation has merely been misinterpreted and is not actually a bug, that would be good to know. Otherwise, it appears to be a bug.
I have attached spoiler screenshots of my combat log
I would also like to thank the GM who delayed the server restart until our fight was over