I have a problem with the site I am working on where pages in russian and latvian sometimes renders incorrectly and show a questionmark in their XhtmlString properties. In CMS when editing it looks fine but when browsing there are errors in the text. The property is renderd whith PropertyFor() and webconfig specifies encoding="utf-8".

The site is in CMS 11 and on DXC environment.

Any suggestions about the cause of this and howe to solve it?