Today's deals categories started not showing a couple of days ago windows 10 Edge browser. Same in chrome. Installed Firefox browser and same thing again. Contacted amazon help who suggested deleting all cookies and site info. Tries this for Edge browser and it had no effect apart from losing all my auto logins. Had a look on my portable win10 PC and oddly that displayed the categories correctly in Edge browser.
Only solution I found so far was to install the Opera browser on my desktop - this did display the categories correctly