Right. I had understood that statement to mean that people were reporting bad data between those three results that were contradictory. That there was an issue on the user end, too. But it's vague enough that it could just mean that the app bug was causing that inconsistency.

The detailed press release seems to indicate that the apparent discrepancy was not do to misreporting by precincts but because the app's reporting functionality didn't include all recorded data in reports. But it doesn't explicitly state that there is no other source of discrepancy, so maybe there was something else.

It may be too late for you to ever see this, but it seems there are in fact other sources of discrepancies in the counts:

https://www.nytimes.com/2020/02/06/upshot/iowa-caucuses-erro...

There's also some dispute about whether satellite caucus rules are being interpreted correctly. (Currently, it's being interpreted in a way that's friendly to Sanders.)

What a complete mess.