Hey,
Can we get a link to your site, so we can see the search box and have a closer look?
What element did you use for the search box? Make sure you are using a text input element from the input section of the Editor and check the settings to make sure that it is not set to “Read Only”.
We also have a complete tutorial that explains how to set up what you are looking for which may help.
Corvid Tutorial: Adding Collection Data Search Functionality
Hope this helps!
Dara | Corvid Team