I'm actually playing 5 games and I can't add any more game.
When I try I receive the message that I have reach the limit of 6 games
This had happened since I added a new game which was never played a few days ago.
Can anybody reset the game counter to it's right value (5 instead of 6)
That opponent has no other games going and has not made any moves in around ten months, so deleting it will give you back your 6th spot. (Deleting the game will not change your statistics or rating)