when i log in through my browser with my group's full url domain name the three buttons to the right of the search for - user menu, membership menu and admin menu i can't see the icons on the buttons and only the content/links when i hover mouse over button - even after i have logged in

However if the url includes https://e-voice.org.uk and my groups name then i can see  the icons on the buttons

Any suggestions what's happened? cant remember what day in noticed it but it's only recently?

Lesley