Your website hijacks the "Back" button (e.g., when I press CMD+[). That's a big no.
Thanks for reminding me.
Update: Fixed. (Expected this to require a rewrite but... it was just a matter of passing one option to react-router.)
I've just tested on Chromium 118.0.5993.70, Firefox 118.0.2 and Safari (iOS 17.0.3) and the issue seems to be gone.