OK I found the problem. For some reason within the boostrap-carousel-class.php, might be spelt wrong but that’s pretty close. The code actually edits the meta tag. There is no reason for this, well none I’m aware of.
On line 59/60 might have lost count. Your looking for
update_post_meta( $post_id, 'bre_add_to_home_carousel', isset( $_POST['bre_add_to_home_carousel'] ) );
Comment it out, this only works for products not added to the carousel.
There is a similar bug on line 67/68. It’s within the else and says update_post_meta.
I have an alternative slider already, so I commented out both lines. Besides completely breaking the carousel I see no problems.
