My defense team defaults to 7718 pvp points, I believe it has been doing this since near the start of the new pvp system as I have jsut found out I always get less gold in invasions then my guildmates. When setting the team in the defense section I get the correct power ranking, but regardless of how strong (or weak) it is when I click to fight myself, it always shows 7718. Weird eh!
It takes a little while to refresh the value displayed when fighting yourself.
I once set my defense to 4 low level troops and fought myself 4 times before it refreshed.
Its always 7718 though