Dashboard Scroll Bars not working

Hi All

Within CRM 2023 R1.1 on a customer site and in my demo system I'm having problems with some of the scroll bars on dashboards.

When adding a new gadget the scroll bar to select which type doesn't work - if I click List for example I can't scroll through the list of reports to use

  

Also the scroll bar to scroll down the dashboard in case it is too big for the browser window (so not the bar for the page, but the bar for the dashboard) also doesn't work.