Interesting! My interpretation then is that these users maybe did have hourly emails enabled, but the previous setup meant that they’d only get digests when there was new content to share.
With that change, users are now emailed on the digest cycle, even if there’s been no change to the content on the forum, and will stop receiving emails if they visit the site. For example, if a post is made overnight and you have hourly digests, then you’ll get an email an hour until you wake up and check your notifications.
Not sure how I feel about that, but it is definitely logical! Makes a lot more sense if, say, you are only getting a weekly digest. Would be nice to have the ability to configure this - for our site it’d be best to reduce duplicate email noise if we can at all.