@alex.hong
Here is the answer I received from the support team. Hopefully this is helpful to others in the community:
HI Suzanne,
Thanks for getting in touch with Klaviyo Support. My name is Jordyn and I would be happy to help out today.
The reason you're seeing a large drop between email 1 and email 2 is because at the time of Back-population, email 2 (and other emails) were in DRAFT mode. When you back-populate a Flow, if only email 1 is LIVE and all other emails are in draft, subscribers will exit the Flow after receiving email 1.
The Flow was back-populated Thursday, then Email 2 was turned live. Though this happened within a minute, roughly 2000 emails had already gone out for email 1 and had no email 2 to queue for.
If you would like, you can backpopulate the Flow again. Subscribers will queue up for emails that were not there when they first went through the Flow.
Best,
Jordyn at Klaviyo Support
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Brilliant. Thanks for the answer. So just to be sure, if I back populate again, will they skip the message they already received?
- Suzanne
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Yes! They will skip over anything they already received.
Best,
Jordyn at Klaviyo Support