Some sites implement a comparison. I am guessing that is what they have done here.
In other words, you can see the top task completers. The 'YOU' will display the tasks number you have done in those categories for those time frames.....IF you do any. If you don't do any, it will remain blank with simply the YOU display.
When I view it, it shows me the American flag with YOU.
I am guessing when you view it, the Portugal flag displays with YOU.
That is because neither of us had did any tasks in this time frame.
If we were to do some tasks, we would see perhaps not our name, but we would see our tasks scores there and
could compare it to those names we see in the top lists.