Not quite sure. Commented them out now.
EDIT: Had no effect.
Otherwise I’m not seeing anything incorrect and I’m not sure what’s wrong with the “TLS engine” of your Postfix/server.
It appears to have fixed itself now. I’m not quite sure why, but thank you for your help @Osiris!
Perhaps you didn’t reload Postfix directly after a change, but after you’ve reloaded it, it was fixed by the previously made change.
Remember to change smtp_tls_security_level=encrypt back to smtp_tls_security_level=may for better compatibility with SMTP servers on the internet (unfortunately) and reload Postfix after the change 