Your raiderio score is 2534. Your armory score 2532. I don’t know where did you get 2544 score. Armory shows Siege of Boralus 00:30:45 Rating: 323 which corresponds to the run you did week ago.
I’m not sure what exactly happening here, but I don’t think it’s minus rating. If you add all scores from your armory, they add to 2529 score (and probably some fractional parts will add to the missing 3 score.
May be they slightly changed score formula and it bugged interface? Weird stuff, for sure.