Thanks for the info. I’m checking your site and found a problem: the ID of the field contains a space:
That comes from the
$prefix = strtolower($this->attributes['post']['single']);, which transform
Case Study to just
case study. It should be
case_study. Please try this code:
$prefix = str_replace(' ', '_', strtolower($this->attributes['post']['single']));
The space in field ID (and then in the input name/ID) causes unexpected behavior, and that might be a cause to this problem.