Never suggested it was. Was just offering you some suggestions that I have seen work when these kind of problems happen with browsers. Once I tried several different browser and got the same results, I can only conclude it is more on the Ebay side of things. As all five browsers I checked gave the same results.
I never bothered to check browsers as you stated it was working fine in Firefox and Chrome. My bad for not checking them myself on my end. I have seen this kind of thing go on with Ebay when they are doing maintenance or upgrades on their servers. Their site can be very sporadic when this is happening. They try to do it seamlessly but that is not always the case.
Plus as ColdCase alluded too, some sites in Safari can be fussy. I have not run into any myself, but that does not mean they do not exist.