Are you talking about the GXP or the C-bill?
If it is the C-bill it is a visual bug. The subtotal is not the amount of C-Bills earned before the bonuses are added in, it actually is the overall total earned with everything added in.
If you are talking about the GXP, have you added up all the numbers? It is possible the GXP subtotal=total is bugged like it is for the C-Bill amount
Edited
I got my wired crossed (too much rum and coke...!!!)
The XP on the left side of the screen when you look at player stats? It is a visual bug and others have reported it. The subtotal is not the real subtotal, it is a copy of the real total and includes everything.
Edited by Tarl Cabot, 25 December 2014 - 05:25 PM.