SharePoint "Did you mean" returning suggestion that is spelled the same as the search term

Question

We're seeing a strange issue where the SharePoint "Did you mean" feature is returning a suggestion spelled exactly the same as the search term.

Our Search spelling dictionary is set to Dynamic so we're not sure why this would be happening.

We did find an article mentioning similar behavior when users clicked on a refiner from the search results but that is not the case with us. DYM not working with refiner

I'm wondering if anyone has seen this behavior and any suggestions about a fix besides modifying the display template to stop showing the DYM suggestion if it matches the search term.

More Info: I was able to figure out an instance that causes the duplicate results although I'm not sure why. This query in our search results web part causes the issue:

{SearchBoxQuery} ((ContentClass=STS_Web OR ContentTypeId:0x010100C568DB52D9D0A14D9B2FDCC96666E9F2007948130EC3DB064584E219954237AF39*) -ContentClass=STS_ListItem_DocumentLibrary) OR (BCSEntityName=IHITV) OR ( PartialPath:/communities/blogs/)

This one doesn't:

{SearchBoxQuery} ((ContentClass=STS_Web OR ContentTypeId:0x010100C568DB52D9D0A14D9B2FDCC96666E9F2007948130EC3DB064584E219954237AF39*) -ContentClass=STS_ListItem_DocumentLibrary) OR (BCSEntityName=IHITV)

Answer 1

I had this issue in a project where we were using * on the end of a query.

In a completely ootb search site, add * to the end of a word or words, it will come back with the suggestion being the same as the query.

It only does this in SharePoint 2013 on premises, and not in Office 365. I contacted Microsoft regarding this to find out if there was a patch to fix it, but had no luck.

It doesn't look like you are using wildcards for the search term, but thought this information might be useful for others.