I have the exact same problem, it has happened in both games I've started after recently installing the game anew and updating to 2.03. I have played the game and it's expansions now and then ever since it came out, but never seen this before.
And reloading a previous save, whether quicksave or autosaves, hasn't helped, as the bug reappears in the same place over and over, whatever I try to do differently. And once the bug has appeared, it's there also if I reload a previous save which was fine earlier, I have to restart the game to get previous saves to work again. But then of course the bug still reappers on the same round as previously.
Any clues as to a cause and/or a solution?