It is possible that the font used on some parts of your website do not support Umlaut letters. You can contact our Support Team and ask them to check the font used on your website. If the font is stripped of special characters then we might be able to find a version of that font that has them and you'll be able to use special characters within the pages on your website. If the font doesn't have the Umlaut characters then you should look into using a different font. Our Support Specialists will be happy to assist you.