Hi,
Make sure to change the redirection URL to the regular results page. Redirecting to a custom page will not do anything at all, as WordPress handles the search results by default. If you wish to use a custom page for the results, currently there is only one possible solution by using Elementor Pro to build a custom results page.
If that does not work either, then try deactivating the search plugin to check if the results show up then. If not, then there might be some sort of a misconfiguration in the theme options or another issue.