snip
also, I noticed on the website that when you click the "mail" it will show you a 404 not found page but the email address can be seen on the URL, is that intentional?
I also found that, at first I thought I only had this problem, apparently you also found it.

Because the using the web or http on front: [https://mixy.money/mixy.money@proton.me},
I am really sure that can be fixed if only put:
mixy.money@proton.me 