Don't take these games results serious.

I play quite a lot friendly matches against low level friends. I usually win. But my lower level 2nd team occasionally has hard time against teams which may be 10 skill points apart. I am not sure, but as I remember, usually the team also does not perform well in other normal /friendly matches on same day. So I believe this is a problem relating to team form.

I don't use friendly matches to test my team. It's for earning tokens or color packs. When I feel uncomfortable to play, I will stop.