My website has less than 10 pages: Why does my sitemap have 448 discovered URLs?

I’ve attempted to improve the SEO of my website by submitting a sitemap to Google Search Console.

The status is a success but I have 448 discovered URLs with less than 10 pages on my website: clientsforcounsellors.com/sitemap.xml

Also, when I type in my domain name in the address bar, followed by any slug, e.g. clientsforcounsellors.com/sdlkgr, I’m redirected to my homepage instead of having a 404 page displayed.

What’s the problem here? Do soft 404’s have anything to do with this?