Hi

In the Field Group, you have defined the Provincia field many (20) times. I do not think you are supposed to do this, as they all have the same field slug/name, but they connect differently to the ACF definitions. If I change the field source to _acf_leads_provincia instead of acf_leads_provincia I can then see that each one has a different connecting meta key:

https://www.screencast.com/t/c7pASXMNA

With ACF it makes 3 meta keys per field, like this (in this example for a field named ‘Land’):

#1 _land
#2 field_52f0fc4334f52
#3 land

In our Post Meta form object Meta Key selection list, you have correctly used key #3, without the underscore at the start of the key name. The problem is, our plugin expects just one field for #2 and one field for #1, but in fact there are more.

I need to refer this to our plugin author, Ross, for his input.