I have had this strange problem as well. I had 100 bonuses left on my account and suddenly they went missing. I hope an admin or higher up could answer on to this, but the only logical thing i could think of is that something went wrong in the webserver, more likely in the sql database that holds all the data such as bonuspoints. Maybe it had crashed, maybe it was shut down duo to a DoS/DDoS attack, or an internal bug? We will only know if a Admin + futher investigates this.
There for i bump this thread in all hope that an admin or web deverloper reads this.
~Hijax