Yes, I hunted this bug for a long time. Finally, @Anton L guided me in the right direction.

The German language file has issues with faulty closing html markers. Here's an example, that destroys your maps layout:

I had the same errors in closing </b> markers as well. So, in order to find those wrong markers and correct them, you open the source code of the affected page and search for those markers. You have to search for them in polyglott keys again and then correct them there. As soon as all of them are corrected, your layout will look normal, again.

Note that all of the modules that are loaded into the same page can also be affected by that corrupted language template. I had strange bold texts in notifications, for example and my grid structure of the start page was destroyed.

Thank you, that helps me further

Gerne.