Hi,
Do you experience this issue on the search results page? That is going to be a theme related issue then – the plugin does not add a results page infinite scroll, that is controlled by your theme (or a plugin if you use any). Check your theme settings, I am sure you will find an option to turn that off.
I usually recommend using a paginated results page if possible, infinite loaders are usually made for specific cases and may not work correctly with some plugins, if not coded properly.