here's your 2 points:

1) that formation is ILLEGAL (3players on the same side of the pitch DR-MR-AMR) now:
1a) you played that formation since you started the game without noticing your 20-80% possession
1b) you did NOT play that exact same formation since the start of the game (which me, and everybody else i guess, will bet on)

2) 20-80% possession comes from an ILLEGAL formation, (the one you were using since you started the game)

3) There's NO WAY to manipulate the game, and there's NO known hack for T11