This is a good point actually. As this can totally happen in real, but very rare. Other games would have only the forwards score.
It's not weird because he's a fullback, but because he's Montoya, he's a monster in the game with an average rating of 8.2 in 10 games..
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Regardless..
I've reached November of my first season, found my solid tactics after a few struggles and changes, also some of my players greatly improved after some team cohesion and change in roles
Mandzukic: Target man or Paocher, he becomes a real monster, not many goals but he helps a lot in goal build up and also as a false nine
Dybala: My absolute best player, consistent, professional and always leaves a touch every game, he's best played as a striker but I already have Mandzu and Morata so I'm playing him AML with an inside forward role, he can do better but this is good enough for me
Morata: my best striker, not a very good target man though, best player advanced or complete forward
Cuadrado: Became a real gem after a few weeks, my right wing inside forward, wastes a lot of chances but rapes left backs.
Sturaro, Lemina and Hernanes all found their forms, average players who do the midfield job without adding any magic, but they also rarely make mistakes, Kinda like the Marchisio before Conte
Alex Sandro is pretty good too
This is the tactics I'm using, and my results, and if anyone else is playing please do share yours.