If you are missing a tile, that you are certain you have visited, it is most likely because we have gotten a gps-track from Strava, that isn’t accurate enough. If you have gone to a tile really fast, or just for some meters, it might not show up in Wandrio.
We have built a feature to fix this. You can click on a tile, that you have visited, but doesn’t show as a visited tile in Strava. A button will show up that says “I think I have been here”. By clicking this button we will check the routes that go near that tile and download a detailed version of them, so you’ll get tile that is rightfully yours!