That is terrible.

Would it be worth ringing ebay to get them to look at the listing?

I know you can change it yourself but I was wondering if it might be worth finding out if they can tell in any way whether it is ebay that made the change or whether they will swear the system did not do any such thing.

You can't be the only one it is happening to. Pesumably it isn't affecting all ads or they would know but they need people to complain as with enough numbers, they might see there is a problem.

My worry would be that although you might be onto it this time around, eventually the glitch might affect an ad where someone buys something you don't have before you have a chance to adjust the ad.