Facer Android app uses lots of background data

I have Sony Xperia Z5 Compact with latest Android Nougat. Facer app has used background data about 14,6 MB since beginning of March. I have disabled background data for Facer in Settings. I have also set weather data off in Facer settings and there are no weather elements in the watch face I use.

So what is Facer downloading so much secretly when I don’t even open the app and change watch faces?