Hmm.  That could have easily been insurance kicking in if our hardware didn't have 100% uptime for that week.  Not sure though, since it's such a small amount I would have to dig through the logs.  It could have also bounced back unintentionally -- which could possibly explain why we have had excess Bitcoins in the payday wallet for quite awhile now (around 8 BTC - 15 BTC after each payout).  

Either way, things appear to be running very smoothly.