AutoCompleteData Suggestions returning wrong options

/rest/api/2/jql/autocompletedata/suggestions?fieldName=Category

The response for the options returned is wrong - different list of options than what we have.
I get the correct fields from the customField section from this API

/rest/api/2/issue/createmeta?projectKeys=AT&expand=projects.issuetypes.fields&issuetypeNames=Bug

How come a wrong response is returned?