Crooked Smile 8 Days After Juvederm in Nasolabial Folds, Why Would this Happen?

I had Juvederm in my nasolabial folds, and it looked great - hardly any swelling, no bruising, very natural look. I have a picture taken exactly 48 hours later (with a big smile) that confirms this. 8 days later, I woke with an asymmetrical smile. My left side is normal, but I am only able to half-smile on the right, and my cheek is dropping. I started a steroid taper yesterday in case it's a nerve, but I have no pain. I also thought Juvederm didn't migrate after 1-2 days. I look a bit odd.