Google Chrome and Firefox show errors. I'm not sure but it seems there are several problems with jQuery. The template works fine on some sites and with several extension. No errors there, only the RealEstateManager brings those errors. (Please see screenshot.)
Please visit start page at
www.sonder-und-spezialimmobilien.de/
There you see the slider as it should work.
When opening the page with RealEstateManager, you'll see it is destroyed:
www.sonder-und-spezialimmobilien.de/mark...z/665/all_categories
same when viewing a single item:
www.sonder-und-spezialimmobilien.de/mark...ments-at-cityvillage
In addition, the mobile menu does not work any longer with your extension. Simply make your browser window smaller till the three bars appear in the top, they work on every page but not with RealEstateManager.