You could be stuck in a loop persisting from eBay blocking you. Try the usual, switch off the compatibility view, clear out cookies and cache and reboot. If this does not work make sure you have the latest version of your browser. eBay will not be running on older versions as a security measure.

change to another browser if problems cannot be fixed, as eBay is more compatible with Firefox and Chrome than with IE.

the other thing is, if using a mobile device, best to use the browser in full or classic view, not the mobile view. The eBay app is also fraught with problems so best to use a browser.