Hi there!
In general, your listing score is simply a representation of how your complete your listing is among all of Moz Local's partners and non-partners. While I would consider it strange that you'd see an immediate change in listing score, it doesn't seem like it could be related to Moz Local's updates because the changes we make usually take a few weeks to propagate.
With respect to the Facebook page, there can be a number of reasons why it's not showing up. I'd recommend checking out the 'FAQ' section of this article for some reasons why it may not be visible to Moz Local: https://mza.bundledseo.com/help/guides/local/listing
If you're still encountering issues after taking a look at those factors, then I'm certainly happy to investigate :). I hope this helps! Feel free to let me know if you have any further questions or concerns! Thanks, and have an awesome day!