Contacts were synced, now they show as Not Accepting Marketing

We worked with a Klayvio rep to sync our Shopify and pull in our mailing list. Once that happened, there was an issue with some people getting a confirmation of subscription, even though they had been subscribed for months. We were told this was a glitch because of the double opt in/single opt in information between Shopify and Klayvio, and they apologized.

Now that I’m in our account, it says we have 4,000 profiles and 2 suppressed profiles. When we exported from Mailchimp prior to syncing with Klayvio, we had a total of ~3600; about ~2400 subscribed, ~50 cleaned, ~100 unsubscribed, and the rest non-subscribed. I was told the reason why there were more in total is because Klayvio scrapes more data. That’s not the issue.

The issue is that it seems very clear that the designation each profile has had in Mailchimp has not carried over. Our newsletter list is pulling in ~300, and it appears that thousands of people that were previously opted in now show an opt out. And even of the ones who were cleaned or unsubscribed and should show up in Supressed are clearly not, since there are only two in total.

I am assuming there was some glitch with the sync that the rep did, so I want to delete all the contacts and upload the CSVs manually that I have. They were made 6 days ago so I’ll have to see how many new people have subscribed since then and make sure not to delete those. However, I have two questions:

• If after I delete the incorrectly classified people, I try to manually upload our Subscribed list, is it going to reject then because it will recognize them as having previously existed and having selected Not Opted In and it will look like I’m trying to add them without their permission?
• Is the same glitch we were told about that happened to us earlier going to happen again, where certain people are going to get double opt in confirmations out of nowhere?

Thank you