Date/Time selection dropdown doesn't work with flatsome theme (but ok with astra theme)

[rafamerino]

Describe the bug
I've tested first your plugin in a demo WP I have for testing purposes, and everything was perfect.
But in flatsome, as the theme loads it's own checkout files, the pickup date/time dropdown doesn't appears.

To Reproduce
Steps to reproduce the behavior:

1. Install plugin and configure it with default theme, all ok
2. Install and activate flatsome theme
3. Dropdow doesn't load in checkout page

Screenshots
Here's working with astra theme:
https://i.imgur.com/pXVCLzH.png

Here's the same config but with flatsome theme
https://i.imgur.com/xt1h013.png