When searching is set to use multiple fields (such as "category" and "title"), and when the search matches on both category AND title, a category search shows the same line twice.

See jsfiddle here.
Any tips on how to omit redundant results?
fullTextSearch parameter set to exact seem to broke something while searching on multiple fields... (summon @hammy2899 and @jlukic).
Just initialize your search component with fullTextSearch set to true or false, according to the desired behavior.
Will address in patch next week.
Fixed in 2.3.1