Copied from comments, so the question will indicate an answer has been provided:
Found your key symptom. Inspecting your Impressum page with Chrome indicates loads of 404 errors. For example: http://darius-mann.com/smardigo/impressum/costum/hexagon/hexagon.js not found. If I remove the “impressum/” the file opens correctly.
However your theme is building your reference URLs, it is including the current page URL, not just the site URL. You might reference this WPBeginner article for the best way to reference CSS and JS files from your theme or plugin
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