There have been issues with the Starcraft II ladder system recently, where players have been getting the borders on their portraits of higher leagues than where they are actually at per their mmr.
Examples posted by others on the r/starcraft subreddit:
This is not the biggest issue in the world, of course, but it would nevertheless be great to have the portrait borders properly match the player’s actual league again. It is, after all, one of the most basic parts of the game and its problems may be confusing to newer players as well as frustrating to the longer time players. Please fix this as soon as possible.