Strong player but low statistics?

[mmmerz]

Hey fellow managers hope u'r all doing great, i'm a level 2 manager
and i've got these 2 high quality players but they have low statistics/form so i was wondering why,
first player is (DMR, MR)
Age: 27
Quality: 30
stats: 6-7-7-7-7 in league
4-6-7 in cup
7-5-6 in champions league
played 12 games in total scored 0 goals and assisted 0.

sometimes i played him as MR with red arrows and sometimes as DMR

other player is (MC)

Age: 22
Quality: 28
Stats: 7-7-8-6-7 in League
5-7-6-7 in cup
6-5-6-7 in champions league
Played 17 games in total scored 5 goals only and assisted 0.

mostly play him as MC with red arrows.

both players growth is Average.

And i have much lower players in terms of quality but their statistics are like 7-8-9-8-8-9 and they score goals and assist,
even my DMC and DML have more assists and goals than them.

So i was wondering why is this happening?
Thank you.