Welcome to the Q&A Forum

It's pretty likely it's the index. This one was quite a bit smaller than the last, so a lot of URLs are missing. That affects link metrics like PA/DA, as well. Patrick's link to Moz Health and Rand's Q&A post will give you more information. Do your due diligence, of course—it's possible that the issue _isn't _the update. But if nothing else has changed for you, that's the most likely explanation.

You can also archive the campaign, it wont add up to your campaign and if the client ever comes back or you want to review something its still there for you. Glad you found it though