An active 10-20% weaker team can win even by 2 goals or more if you have many of the other factors against you. For example, if you got your tactics wrong and top of that you got a bad roll of the dice. That will be not be a troll as 20% quality advantage is not expected to overcome the bad effects of the other 2 factors.
Maybe the game is significantly more about luck these days as compared to 3-4 years ago, and hence why more unexpected results happen. They reduced the complexity in the calculation match outcomes maybe to reduce CPU and RAM loads on servers and hence cut operating costs.
The assumption is that if you are losing and much stronger, you would change your tactics. A bad roll of the dice is a troll in the making.
Level 20
18 x League Champion
15 x Champions League Winner (4 x Runner Up)
17 x Cup Winner (2 x Runner Up)
13 x Super Cup Winner (1 x Runner Up)
929 Wins/ 55 Draws / 40 Losses
4367 Goals Scored / 509 Goals Conceded/ 267 Games Longest Unbeaten Streak