I have a form which was created using LiveCycle Designer ES4 and I enabled form saving (Reader extended PDF) with Adobe Acrobat Pro DC.
The problem is, that upon opening such files with Adobe reader, some table body rows or subforms (which can be repeated) create a new instance. When
a user fills out the form, saves it, and reopens it, a new row / subform instance is created again. In some other discussion I read, tad data binding causes the issue, but I tried to set data binding to "No data binding" not only for the whole table, but for every object in in, and still, every time the file is opened, a new instance is created.
Right now, I have set up a js script that upon opening the file loops all tables and deletes these random new row instances, but that's just a quick fix.