Tables jump around when adding categories to fields.

[mfbrown]

Bug Description

When you add a data category on a field which is in a dataset in a collection other than the first collection of a system, then on save, the table jumps back to the first collection, without updating the dropdown.

Load a dataset with multiple collections (see attached zip)

Steps to Reproduce

1. Load the attached dataset
2. Load the collection: cls_classification_detail
3. Modify the data category on a field
4. Save

You'll see the table jump around

Expected behavior

The table should continue to show the collection that was just edited.

Screenshots

Environment

Additional context

Add any other context about the problem here. dataset.yml.zip