Sometimes we receive reports that Kurviger does not behave as expected. Most issues are created by incompatible browsers. If you use Internet Explorer and not happy with the way Kurviger behaves on Internet Explorer, please switch to Google Chrome, Edge or Firefox. Safari should work fine on Big Sur and newer. If you run macOs Catalina or older, Safari might have issues with parts of the Kurviger website.
Sometimes the issues are also created by third party plugins like Ad Blockers, NoScript, or similar extensions that limit the browser capabilities. I perfectly understand your wish to protect your private data while surfing, but some of these plugins might create unexpected results that are often not reproducible. Often the only solution is to disable these plugins while surfing on Kurviger or try things like incognito mode or a different browser.