As I was saying to Chickma2 in another thread, this often isn't the kind of thing that just goes away magically when you fix it.
It's something you need to stay on top of and monitor, at least for several months, sometimes years, sometimes forever.
If you've ruled out structural reasons for this, then I would advise you, since you've only been squatting for a few months, to not be satisfied with feeling like you've fixed it. Find a coach or a buddy who knows what s/he is doing to watch you squat regularly and alert you when you slip back into bad habits. If you can't find someone qualified to help you, video your squats for at least six months straight to make sure you're keeping straight. If you start to slip, fix it.