about the signals history

 
Why some of the signals have a long time history like 1 year or 2 years, but we never seen them before, and we can see the equity for only 1 or 2 month? 
 
I tthink - providers traded using his system/account before attaching it to the signal (it is my explanation sorry).
 
newdigital:
I tthink - providers traded using his system/account before attaching it to the signal (it is my explanation sorry).
Thank you