You should contact the community team and let them know. If you're not logged into the site, make sure you provide a link to your profile (just click on your avatar at the top of the page to find it) and (if possible) provide links to the posts that should be attached to your account.
Sometimes interesting things happen during migrations, which the community team can easily fix. We usually answer support requests within 24 hours of them being submitted, often sooner, so it won't be long before we can get it corrected for you (though, expect some delay late Fridays and over the weekend).
It's a fairly simple thing to fix. Don't worry - just drop us a line.