Hilton did an IT "upgrade" at the end of October, and since then their systems are fubar. If you read a few of the recent threads, you'll see that points are missing all over the place, for various reasons.They are still trying to fix the system (and occasionally breaking different things in the process), I am holding on to hope that they will eventually get their systems fixed, and everything will credit properly, but I am also keeping tabs on how many points are missing.
Good luck getting your issue resolved.