Hi @gamliel
there are older topics with the same domain name - Unable to renew certificate with redirect cpanel and application gateway - looks like you have changed your user name.
That's bad because the history is missing.
And checking your domain - clientzone.budsfx.com - Make your website better - DNS, redirects, mixed content, certificates - there is the intermediate certificate sent.
Chain (complete) 1 CN=clientzone.budsfx.com
2 CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
But there is a redirect to https://clientzone.easyfx.eu/, there is an incomplete chain:
Chain - incomplete
1 CN=clientzone.easyfx.eu
But there is an Apache, so normally you don't use a .pfx file.