Something like that could arise if you use a Content Template in the output of a View and the template also outputs the same View, though there may be other ways this could happen.
What is the structure of templates and Views used on the page, or anything that outputs the post body?
I noticed that your search guide "Sales" was now showing the search results correctly.
{yourwebsite.com}/search-guide/sales/
However, the one from your screenshot "Rent a Vacation House" wasn't showing any results.
That is because it is calling the view named "Search Vacation Houses by Regions", but the view can't find the content template with the slug 'loop-item-in-search-vacation-houses', that is being called in its loop:
I've updated that content template shortcode to use the content template with the slug "loop-item-in-search-sales-by-region" and the results are showing now:
( {yourwebsite.com}/search-guide/rent-a-vacation-house/ )