Window 11 Pro Insider Preview
Brave Browser
Raspberry light Debian 1:6.12.62-1+rpt1 (2025-12-18) aarch64
Pihole up to date but data fields each have a whirlygig, and the Queries bar has 3 dashes in each field
Donate button works!
I have learned a new cool word today : Whirligig - Wikipedia
Thnx! 
But ehm...
How about some more information and maybe upload a Debug Token for the developers ?? 
https://tricorder.pi-hole.net/oWV8WxpP/
When in Rome.....
I think this is the issue.
Brave uses an older/outdated javascript engine that doesn't understand the modern v regex flag, resulting in some errors and breaking the web interface.
A fix for this issue was already merged in development branch and it will be on the next release.
If you are really affected by this issue, you can use a different browser to access the web interface while you wait for the next release.
Bingo, OK with Edge, many thanks