SSL certificate issued but self-signed certificate is being served

Welcome to the forum

Before I start, please be aware this is a community forum, none of us are InfinityFree staff.

the certificate looks to be working fine to me:

So maybe try clearing cache and try again?

Also since you’re using a custom domain, you may want to look into using Cloudflare, that can help with forcing all traffic to HTTPS, reduce your server load (helping avoid suspensions), and help avoid ddos attacks.

Here’s a guide if you’re intrested: