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All of them will loosen up for a few months, then they'll start to tighten up later. If they're not coming undone right now, just let them be. The roots will be loose for a while, too. I have at least an inch and a half of undreaded roots on some, and they're shrinking/tightening up slowly every day.
They won't be perfect at first! Just make sure NOT to re-backcomb them in a few weeks when they become loose. That will only hinder the process.