Is my Jaw filler being injected properly?

Its hard to tell without before and after pictures. What you describe is that when you bite down, you are clenching your masseter muscles, which are the jaw muscles that sit on the side of the angle of the mandible bone. Biting down, causes them to flex, hence you look more angled. If you compare your results to your before pictures, hopefully you will see a more angled jaw after the voluma placement. Sometimes more filler is required to achieve the requested results. Once again, its hard to determine exactly what will help unless we have pictures. 

In the posterior jaw over the masseter muscle, I prefer sculptra injections for this very reason.  Sculptra grows your own collagen over time and lasts more than 2 years.  The effect is gradual and natural appearing over the masseter.For the lower face, I
recommend Sculptra
posteriorly, Juvederm or Restalyne anteriorly. Voluma is best for boney
augmentation. I wouldn't use it in soft tissue.

Thank you for your question, and I am sorry that your results have not been what you anticipated. It appears that you had your Voluma injected at the back of your jaw, termed the angle. In this location, clenching your teeth will accentuate the musculature and make your jaw appear more defined.  The lack of difference in your appearance may be the result of too little Voluma, but to be sure I would compare your pre and post pictures to assess your results. If you would like to add further volume, your injector should be able to help you further.  

Often more filler is needed here than you think.  Sculptra long term will give you a more robust response and often is used in combination in my practice with the other fillers like voluma or radiesse.  Best, Dr. Emer.

When you are biting down and clenching your teeth you are seeing the masseter muscle contract.  As this muscle shortens with contraction it makes your jaw appear more defined and angular.  Depending on the volume of your face it may require more of a filler to see a result (more subcutaneous fat the you have along your jawline, the more filler that it will require to show a difference).  Voluma is indicated for malar (cheek) region and it can be used off label for bone augmentation, although this is a discussion that you should have with your injector as to which filler would work best for you.  You do want a filler with a higher "G prime" number as this gives more lift of the subcutaneous tissue.  You can always add more filler, so the best way to achieve the desired look is with a conservative approach and you may benefit from some additional filler.

Without photos, it is virtually impossible to determine an answer or help you.And has already been stated, it all depends on the placement of the filler.The good news is that it will dissolve with time.If you are really unhappy with the results, an injection of enzyme will remove the filler.Make an appointment with your physician and discuss your wants and needs.