Updating my listing in Pets failed repeatedly

I have a listing in the Pets for sale section, trying to update it with more info and photos. In the update listing process, it won't click through from the 'Contacts' screen to the "promote' screen, until my browser asks me to 'stop' the page, and when it does it gives the wrong finish date for the ad, won't let me update that; and says it can't calculate the fees. There should be no fees.

I've logged out & in, cleared caches and cookies (then had to re-log into every other darn thing as well, grrr), all the thingies; and it still will not finish updating the listing. Is there a glitch, what else can I try? I don't want to withdraw the listing and redo, it because then I will be charged another $9 for the new advert, when the old one didn't do what it is supposed to!