it could be with your ISP. I've had that in the past so I used to copy my post before posting it then went to check it was there. I've also done the clicking back or even refresh thinking I was clicking post too.
It's certainy nothing to do with COL. If it was the mod team, as Jane says we would know and we would also tell you
If it was technical to do with COL then it would affect us all.
T'internet can't half be frustrating