Mail themes are missing logo and share pics

Hello, from the update 13.0.4 we are experiencing problem with missing logo and share pictures in the mail Activities, which nextcloud sends. Versions 13.0.5, 13.0.6 and 14.0.1 didn’t fix this problem.
Here is a screenshot where you can see what I mean:

My setup:
Nextcloud version: 14.0.1
Operating system and version: 16.04
PHP version: 7.1

Any idea where should I look to fix that behaviour or where should be a problem?
Thank you in advance.

Ok I fixed it. It was broken due to wrong configuration in config.php (overwrite.cli.url)