Search results 404 error if not searching from home page

Hi guys,

I have an error which is stopping me from displaying search results. This issue occurs whenever I do a search, thats not in the root of my site - and hence when searching from any other page, I get an error which goes straight to the 404 page.

Example error:
http://demo.xlearn.net.au/learning/my-training/?s=test

This works fine (as its from the root):
http://demo.xlearn.net.au/?s=test

I don't have any issues when I'm using the default Wordpress search, so therefore it must have something to do with the search plugin I'm using:
https://wordpress.org/plugins/searchwp-live-ajax-search/

Any ideas?

Thanks!
Brett