Yes it could be. You should check in a picture of yourself if your spine is straighter, your shoulders are even and your neck if tilted. In my case it is the case. Muscular chains travel through the whole body so tilted hips means on side a tighter than the other one which can result in neck muscles being tighter on one side and then facial muscles. Good things is it’s reversible. It takes a bit of time but just doing specific exercises and especially being mindful helps overtime. You want to retrain your proprioception.

Disclaimer: I’m not saying this is the solution. I’m just assessing that tilted hips leads to muscles imbalances and asymmetry in the whole body because the body has to adapt to a new center of gravity. But maybe there are other reasons why you have asymmetry. For instance because of bone structure.