Someone else posted something similar and they were on level 8.
I think it was round about then or level 9 I noticed I started getting these crazy results and now at level 14 it's still pretty much the same if not worse. I now worry more about games against teams at the bottom than against the teams at the top.
Yesterday and today I beat the two teams that are stronger than me quite easily. Tomorrow I play the team that is second bottom, haven't won all season and are 4* weaker than me....anybody want to bet what the result will be?