I read that other people also having this problem sometimes, but now i'm experienced this myself.
One of my miners config is suddenly changed to
stratum+tcp://bj.ltc1btc.com:9999 pcfli.nm
stratum+tcp://stratum.f2pool.com:3333 pcfli2.nm
stratum+tcp://stratum.mining.eligius.st:3334 1GwHVTfV3cGMkZXFF36fhzhNbPhyy7TcQr
From the pool hashrate graph it looks like this event was around 12hrs ago.
I already submitted now the pool settings change request on that miner, but also would like to know how this event would be compensated.
I have concluded that this happens sometimes when the Lee Group team swaps out physical S5s to proactively fix problems. I saw this on one of my miners last week where pool 1 was correct but pools 2 and 3 were set to something and someone completely different. When I put in the change request, I noticed the IP address was different than it used to be for that machine. The good news is my change request was finished and correct within 40 minutes.