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There is a chance that your subdomain is the first/default virtual host in your web server setup (or the subdomain's access log is the default log file) so any requests to the server's IP address get logged to this virtual host. That means they didn't access your subdomain, they accessed via your server IP address but got logged in your subdomain's access log.

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And this is the correct answer, thank you.

Transparency logs are fine except if you have a wildcard cert (or no https, obviously).

IP scans are just this: scans for live ports. If you do not provide a host header in your call you get whatever the default response was set up. This can be a default site, a 404 or anything else.

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