My daughter was like this until 30 weeks then she shifted to back to back where she remained until birth. My current pregnancy is exactly the same in regards to legs over their head in every scan. I wouldn't be concerned until something is mentioned. X
Babies will start to go vertical from week 26-28. If they are not on the most common position, you can focus on alignment from week 28 to 32. They can still move afterwards. However, it's always a good idea to make sure you move in ways that create optimal space and alignment for the baby to navigate your pelvis. Spinning babies has loads of good advice that is very easy to do: https://www.spinningbabies.com/pregnancy-birth/daily-activities/
I wouldn’t worry about breech yet. Baby is small enough to move around for many weeks yet and they might actually be changing position throughout the day/night without you noticing.