User tasks stats is returning wrong values

[willemarcel]

I mapped a task and that same task was invalidated.
On the user stats it counted as +1 tasks mapped and +1 tasks invalidated.
Then I set that task as mapped again. The user stats were updated with +1 mapped and +1 invalidated. It should not change as this task was counted previously.

Example: https://tasks-stage.hotosm.org/projects/8579/tasks/?search=81