Why does the bit above my upper lip still look overfilled after I had the filler dissolved twice? (photo)

Juvederm is an HA filler, that is locally injected in dermis, it does not migrate after injections. The product was probably placed in large amounts and in the wrong area and that is the reason why the product is showing. Juvederm normally reacts very well to treatment with Hyaluronidase and you should see improvement as soon as 2- 3 days after injections. I will recommend you to go to an experienced and professional injector that can inject the right amount of Hyaluronidase to that area and get that product dissolved. Best Dr Obaid.  

With time it will go down on it's own as Juvederm is a temporary filler. Since you have had the area dissolved twice with little to no improvement, you can consider dissolving a larger area and possibly starting over.