Hello Nicmo, Is there a bug with the game because the team I put together this morning in my formation isn't at all the same as the one that played lol?

Not that i know of and nothing changed about it since around start of the season.

Did ur team also participated in any tournament in parallel at the time of your league match? And any player got injured or red carded during the tournament? Which would have caused those players replaced by random benched players in ur main team.

No no i do my formation 15 min before the match so i don't understand 

Are you referring to a friendly match? Looks like you had no official games this morning