The search results page shows span html tags in the titles. This bug has been discussed at https://github.com/joomla/joomla-cms/issues/16979 where it was found that the core Joomla code is not at fault.
There are vague descriptions of how core code can be modified to prevent the html code from showing.
However apparently the real issue lies in the way template overrides are used.
Please can you describe the relevant patch for JSN Dome Pro 4.1.0 (bearing in mind this probably affects other templates too)