I finished a solo ops activity and acquired the last bit of gear I needed to cross over 320 power, which also increased my reward rank from silver 1 to silver 2. In the end-of-activity score pop-up, it mistakenly used the fact that I was now silver 2 to calculate the score and showed the wrong rating, even though I had completed all the objectives. This didn't have any tangible effect on me or the loot I acquired from the activity, but it did confuse me a little. The reward score bar on the bottom right of the screen was visibly full, just not the pop-up.