Subdomain / URL to my site in email notifications that is not mine?

I do not know how to best describe the following issue I have. Especially as everything works as expected.

However, the default email notification emails from WordPress informing me about plugin updates contains links to my site, that is from some strange subdomain “url1548” with a cryptical long text attached in the URL.

This subdomain does not exist anywhere in real life. Can’t see it on Cloudways, Cloudflare, not in WordPress itself. I have no idea where this comes from.

Do you have any idea where else I could look?

Is there something like a DNS cache?

Best look at the screenshot to see that weird URL
image

Any hint is perhaps helpful to finally clean this up

Thanks in advance

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