Do you know that the player level and matchmaking level is different?
If you don't , I should tell you. It is the level of the equipped highest level item. When you get matched to an opponent, in the vs screen, it shows the player level of the opponents, than in the game though, it shows both mechs' matchmaking level on the top of the screen.
You can also find your matchmaking level in your workshop, there is a VS:(lv) statement next to your mech's stats...
If this is not what you meant, please elaborate your problem, I might have misunderstood due to lack of information...
Cheers