Hi,
First, when you use a ACF Reusable Field, you have to know that you have one more imbrication in your template, so you have to do a loop with the Reusable Field to get its childs fields.
Secondly, I don’t see where you call your ACF Reusable Field in your template, you have to call it : modules_main_reusable.
Third, I encourage you to use this fork of the plugin if you want to have multiples Reusable field of an ACF Group Field in a flexible field.
https://github.com/mvpdesign/acf-reusable-field-group
Hope it helps.
