Server error 500 in Facebook, but not from Brave browser

When I post my website URL in Facebook, when clicking the link it creates an error message - Internal Sever error 500. However - this does not happen when I use the Brave browser - only the others - Chrome, Edge, Safari. As most people don’t use Brave (yet) I need to resolve when the other browsers create an error, but Brave does not. Any suggestions? My website is www.swimhistory.co.za.