Hi Tim,
That might indicate a javascript issue, that might affect that browser only. Can you check the homepage of our demo, to see if you get the same behavior. I have tried to replicate the issue, but it works correctly on our end.
I also recommend clearing the browser and site cache, that usually helps. If not, then try to hit the F12 button (it might be different) to open the developer tools. Then with the dev tools open, reload the problematic page, and check the console if there are any messages/errors reported. Optimally there should be no errors, maybe a few informative messages.