Hi there!
You might want to double-check if there's an exclusion for this 3rd email (please see screenshots below). If there is an exclusion, that might be why only 625 received it. If there's no exclusion, the subscribers may have completed the sequence or automation before adding this 3rd email. But I recommend that you send an email to help@convertkit.com59 so the team can take a look at your account.

