I had this issue happen this past week. I know, for a fact, that I had responded to a buyer’s request for a custom order, declining it. I know I did because I had another buyer requesting some assistance, and I did both at the same time. However, only one was noted as being done and the other was past the 24-hour window… supposedly.
Apparently, the message I sent to that buyer never posted and I had to do it again. My response rate dropped 1% but is still sitting at 99%. Aggravating because I KNOW I had responded to it within an hour after he asked for assistance. I happened to be at break when I saw it and responded to both of them.
I always check my Fiverr stuff when I’m at break… just in cases such as this.