Some strange pictures over mountains

[leo-irssi]

Has anyone experience strange pictures over mountains? I started seeing this while playing normally and swiping around the map.

Screenshot attached.

[Fleexie]

I have also had that happening to me some times. 

It usually is gone if you close the app and start it again. Or sometimes it just disappears again. 

Personally I don't know the solution or if there is one, however since it just disappear again I don't think it is too much of a bother.