In July, PartyPoker.com offered a special promotion to players whereby money was added to player accounts. This is a temporary dip, and the amounts will reverse for all players who did not participate in the promotion (usually 90% or above ) before the end of the month.
Please get in touch with your Account Manager with your tracker details. Your Account Manager will be able to send you the exact amount of bonus added to your players account.
Feel free to mail me for any clarifications.
Satya