How come when I play Away and watch the game, I don't get most of the possession?

[Alexzz11]

This is the first match I lost Yesterday. Trust me, everyone is in the appropriate Position
Attachment 21238
Attachment 21239

Today's Game:
This is the squad that suffered only 20% position. Usually, I have 2 CM and have 1 AML and 1 AMR. But since my AMR is injured, I put an extra CM. I could've added another ST, but I thought the extra CM would balance out possession, but it clearly didnt.
Attachment 21240

The second time you played an illegal formation so u get 20% possession.

[Christopher McArthur]

Oh ok thank you for your help because my formation was
Gk, 3 CB's, CDM, 3 CM's, CAM, and 2 STK's so affectively a very narrow 3-1-3-1-2 playing through the middle, I noticed the change happened when I changed defending formation from a LB, CB, and a RB into a 3 CB defence, I have never heard of "illegal formation" before but after having read about it that clarifies it for me thanks heads for that.

[Christopher McArthur]

Oh ok thank you for your help because my formation was
Gk, 3 CB's, CDM, 3 CM's, CAM, and 2 STK's so affectively a very narrow 3-1-3-1-2 playing through the middle, I noticed the change happened when I changed defending formation from my original 3 backs a LB, CB, and a RB into a 3 CB defence, I have never heard of "illegal formation" before but after having read about it that clarifies it for me thanks heads for that.
Really appreciate it