Are they on GTC? I assume they were because some were listed back in July. They use up one free listing every time they renew (on the same calendar day each month) but with only 19 listings you should still have plenty to spare.

Sometimes really weird stuff happens on ebay and unless it happens to a lot of people ebay never seem that interested in getting it fixed, unfortunately. That means the isolated glitches are the most devastating for the sellers concerned. I think it pays to have a second selling ID to fall back on if things start to go wrong with the main ID.