Some custom field values not showing in Jira issues macro

GC_a1f2ge

I have a weird issue with Jira Issues Macro for Confluence. 

I have a table with multiple custom fields. There are fields, identical in configuration, both free text/single line but only one of them is showing results. 

Any idea why with 2 identical fields, one would not be showing? 

The column on the left is the one showing values. 

GC_a1f2ge

Update:

I've found more than 1 field named 'client' in the list of available fields. The 'client' field I was selecting is not the one we are using, after selecting the correct one, the information appears.

I can't find this duplicate field in the custom fields section so I'm guessing it's some kind of system field for which we have no access. 

Not sure how to find and remove this duplicate if at all possible but this is my theory.