Best thing you an do is to preserve some screenshots of the discrepancy, and submit it too Larian's formal bug form with as much detail about what you did and what happened as you can - the combat log and combat initiation system in general are still very buggy and temperamental, and while many of the issues have been reported many times, sending more to them directly can only help at this stage.
You can find Larian's formal bug reporting form here:
https://larian.com/support/baldur-s-gate-3#modal
