I can confirm that small bug. If the logo is linked the set padding is missed in the code.
Without link:
<img src="https://www.citylauf-greifswald.de/wp-content/2015/01/BioTechnikum.gif" alt="BioTechnikum" title="BioTechnikum" style="max-width:200px; padding-left: 10px; padding-right:10px">
With link:
<img src="https://www.citylauf-greifswald.de/wp-content/2015/01/Fritz.gif" alt="Fritz Braugasthaus" title="Fritz Braugasthaus">
Bruno