Lost PPP Ops

I logged on to PPP last night and was really happy to see some ops that started coming out quite early, around 10pm. I saw a big one and quickly clicked on it, entered the code and was really happy to find that it was accepted. However, when I had done my post and tried to submit it, I got an error message from PPP telling me that I hadn't reserved the ops! I was really upset and tried taking it again but it was all gone by then. I don't know why this happens! :(