It might be that the certificate is still loaded in when the certificate is deleted through the control panel. This could be a bug.
On the other hand, what exactly are you hoping will happen by deleting the SSL certificate? Sure, the Let’s Encrypt installation is completely so you get SSL errors because of that. But what do you expect will happen if you remove the certificate? I think Jetpack will still get SSL errors, and then your browser will too because you’re using HTTPS without an SSL certificate installed.
If you don’t want to use SSL, make sure your website doesn’t use HTTPS. So change your Website URL back to http://wottv.ga instead of https://, remove any .htaccess rules which enforce redirects and remove extensions like Really Simple SSL.
Having your website configured for HTTPS and removing SSL will not make your website use HTTP. It will make your website inaccessible instead.