My twin and I’s Juvederm ultra filler goes away after 1 month? Why and what can we do? (Photo)

My identical twin and myself have gotten a syringe of juvederm ultra in December then it disappeared in less than a month- so we came back in and did a syringe and a half of juvederm ultra in January. This also only lasted about a month. We have fast metabolism- but not that fast. Our friend who is also a circus performer and goes to the gym twice a day can keep her filler. 2nd question: I have woken up in the morning and my filler has magically returned for the one day but lopsided- why?