Not sure about jumble specifically, but we've hit a very similar-sounding class of bug in our own PWA (NOSTRAS) — a stale service worker stuck after a deploy update was the cause both times for us, bad enough that a normal reload didn't fix it either. Worth checking DevTools > Application > Servic...

nostr:nprofile1qqstzrxzhllsxw5wfha23q96kn3rmec55lpqageptgxxg7r7qz0qzls7ut9n0 does it crash on load or after it has been open a while? brave shields and a long relay list are the two i would separate first.