It could be the problem is your tendons and not your bones! Not that you need more to do, but strengthening exercises might help. Or, it could be that your tendon just never completely regained health, and doesn't keep tight when it needs to, but stays "stretched out." But you know I'm not a medical doctor.

You are certainly worth it! Buy a light stretchy ankle support and wear it for a few weeks and see if that helps (it will certainly give you support!)