BizTalk Mapper only returning first row to destination schema

I’ve been working with BizTalk for close to 7 years now but for the last few I was mainly on the administration side. Recently I got back into development and have an issue that has me stumped.

I have a source XML schema with a Member record that is set with MinOccurs 0 and MaxOccurs unbounded. I have a destination flat file schema with a Detail Record set with Min 0 and Max unbounded.

When I validate instance on each of the schemas with test files every record I expect comes through in the results.

I have a map with a 1 to 1 mapping from Member to Detail with no functoids. I’ve tried everything I can think of (Mapping the Member Record Directly to Detail Record, no link between Member and Detail, Linking the two with a logical exists functoid, linking the two with a looping functoid). It doesn’t matter what I do only the first record from the source file gets mapped over to the destination file when I test the map in the IDE or run it through BizTalk in its deployed app. Below is a pic of the amp with no link from Member to Detail. The Header record in the destination schema is a Min 1 Max 1 occurrence and it has defaulted values directly from the schema. I have a feeling I’m missing something obvious (I’ve even tried deleting and re-creating the map) and any help would be appreciated.