Time dropdowns blank when scheduling webinar sessions

I have an issue in both Chrome & Edge.  When I add another session, the dropdowns for the start & end times are blank.  This started last week, I assumed it was a glitch that would be resolved quickly.  But I'm scheduling webinars today & see the issue is still there.  I have tried on two different computers using Chrome & also in Edge on one of the computers.  You can click the spot where you think the correct number will be & it appears after clicking out of the dropdown.  So I'm working around it but it's a time waster & annoying.