Hi!
The first URL seems to be the correct results page URI, the other one is likely some custom rewrite condition, probably added by the theme.
You can adjust the plugin to redirect to this custom structure here: https://i.imgur.com/WyjbT7p.png
You also have the Lite version of the plugin active, which will could conflict with the results page. Make sure only the Pro version is active, otherwise both overrides may activate, and you may not get consistent results.