1) Please recheck for any cache plugins, like "WP Super Cache" or "W3 Total Cache". If you are using someone, please deactivate it or add the exception to the pages with booking form and search form and search results for do not cache these pages.
2) Please recheck that you inserted into the content of separated posts or pages the booking forms (shortcode [booking ...]) for the parent (resource with some capacity) or single booking resources. If you had inserted the child resources, then these booking resources will not display in search results.
Please read more about configuration of booking resources here and about capacity concept here.
3) Please open the Booking > Settings > Search page and click on "Clear cache" button, you have to see the number of found pages with booking forms.
4) Please recheck how the search availability functionality is working depend from settings of different parameters.
After this you can test search form at front-end.
You can also be interesting in adding different additional parameters to the search form.