With the new crossplay update, they removed the option to select your region and the matchmaker now puts you in the closest region based on your ping. Since the leader-board even says, you have 25+ games played on every role. They may not be on the same region.
Could have happened due to a ping spike on one of the EU servers, so the system thought you were closer to Americas. This happens to me if I join the practice range as soon as I start Overwatch. I always land on an NA server with a ping of ~120ms. (Happened once in comp as well)
So I think it’s a flaw in the design of the system or it was just a bug. Cuz you did nothing wrong