I occasionally have this challenge with my survey.
I have a parent form which will also links with a child form. Once in a while I encounter a problem where a previously completed child forms/instances (subform) does not appear but instead the Create New Instance only appears. The instance data will be there but it just can’t show up on the completed instances. I tried checking the linking columns to see if they match and always I get these to be matching but still the issue persist.
Would anyone have any idea about this and any indication of where the issue might be?