Different certificates are served for same request

I have an app which is served on an XYZ.fly.dev url. I have issued a certificate for it 5 days ago, and can see it on the web dashboard as well as in the fly cli output.
The issue is the tls connection with the site is sometime with the certificate I issued (XYZ.fly.dev) and sometimes with fly’s wildcard certificate: (*.fly.dev).
I am running curl https://XYZ.fly.dev/ --verbose multiple times and can see that the certificate is sometimes my specific certificate and sometimes the wildcard certificate.
My goal is that my my specific certificate will be used each time.

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