GRC's TLS fingerprint website throws an error at my site

I’m using this website to fetch the SHA1 fingerprint for, but the website says something about,

“the server may be answering HTTPS as if it was HTTP and returning a web page rather than a proper SSL/TLS setup handshake. (We have encountered this behavior.)”

Why is this? I have looked over my website and I see no block in the WAF or any kind of configuration that may stick out that could potentially pose a problem. I’m using full strict TLS.

Many thanks to any insight.

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