Transaction email are not sent Magento 2.3.1 + DigitalOcean server

Hi,

I don’t know how it happened that I didn’t attach the screenshot.
Please find attached bellow.

Magento config is OK but the template itself not. It is a default Magento template.
As I said when I remove the highlighted entry I can preview the email.

Can you give me a tip what are these highlighted entries for?
Thank you.

Pawel