Hello Ricardo

The search issue is probably related to your query. If it's anything other than a simple

SELECT * FROM table

Then it can cause issues like this. If you have a more complicated query, please create a view in the database, and pull that

SELECT * FROM view1

As for the dropdown, the issue definitely is with the bootstrap, but I'll need to remote in, and check our code to see if I can help you with it.

Please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. 

You can write credentials here just check Private Reply so nobody can see them except us.

Hi again Ricardo

When I check the table both the drop-down:

And Search:

work fine. This is in front-end. Can you delete cache on your browser and try again?

Oh, right, sorry Ricardo

Yeah, you will need to do it again once the plugin updates.

With every update, this has a chance to stop working again. Since we don't know with which plugin the bootstrap files are in conflict with, there's no telling which plugin's update can either resolve the issue permanently or cause it not to work anymore.