Numbers spreadsheets seen as developer files in Spotlight

In Spotlight Search, my Numbers (.numbers) files show up under the category "developer".

I am not sure what I have done to cause this. Is there something I can do to have the Numbers spreadsheets show up under the "spreadsheet" category in the Spotlight Search?

More specifically: In Spotlight, when searching for a file named "spreadsheet.numbers", I begin to type in the word "spreadsheet". The ".numbers" extension automatically appears in grey and I see "spreadsheet.numbers" listed as "Top Hit" and I see other numbers documents listed under "Developer" and I see "spreadsheet.xlsx" listed under "Spreadsheets" (I also see other unrelated files in other categories.)

Note: this does not happen with Pages files, only with Numbers files.