Did you resave your avatar?

The only other thing I can think of is if you have taken clothing out at any point. Like if I had 14,500 in mine, then sold off a bunch til I was at 14,000. Even if I went back later and bought 500 more pieces to put back in, my counter would still be at 14,500.

If you are sure that you have 15k I would file a ticket and see if they can reward it manually.

That is always my last effort to figure it out xD No worries! I am sure you will get there in no time! Locking as resolved.