This is a bug and will be fixed in a future Mosaic release.
The problem is that if a repeating section in a form template has at least one question using a dynamic URI, then any answer to a question using a static DS URI in the same table or repeating section will fail to populate.
This is seen when a Find Party subsection is added to a repeating section which also contains an editable question with a static URI.
This is due to a piece of code which wrongly assumes that it is not possible for a collection to use both static and dynamic URIs.
Dynamic URIs are those that relate to the ‘party’ found using the find party option, which then pulls through information from the record of that party. The short-term solution is to update the form design to allow for this.