The new Edge(release) is displaying only in Chinese

I live in the UK and I am English. I cannot speak Chinese. My PC is set up with region English UK and keyboard layout is English UK. I have never seen this until I created a new PC account. I opened Microsoft Edge, all was OK. I then created an Amazon seller account. After I logged in, everything changed to simplified Chinese. Although I could translate the page to English, it's clear that everything is in simplified Chinese. I struggle to understand how this could happen. How do I know whether my PC has been compromised (or not)?

Is this a known problem?