Seems that there was an issue if the first batch of receipts were all of the old format, the guys behind pistats.io is looking into it right now[1]
[1]: https://twitter.com/pistatsio/status/580214043715072001
[1]: https://twitter.com/pistatsio/status/580214043715072001
This response, if correctly linked, does not inspire confidence that they care about my privacy concerns.
Edit: Looks like mts was addressing a bug?