Hello I dont see my Player stats on the AAPG Servers anymore.

What could be the reason?

My in game nick is : X_ApplePIE

Thanks in advance

Users who have claimed their server page have the ability to reset individual player stats. I suggest contacting the person that claimed the server first.

So you mean an server admin/owner can delete my tracked stats on the server?
Whats the point of tracking stats then if someone could delete it??

Yes.
People may want to start over, people may want to reset the previous owner's stats, etc. A number of possible reasons why someone would want to remove stats. You can contact the owner for questions, or just play on a new server.