In most cases is not the machine, but how the artist uses the machine. Not trying to say that you don't know what you doing but you may be used to a way of tattooing that must adapt to your new Rapier.
Do you check your needles? you may have had hooks, a bad batch can ruin tattoos.
That scaring looks severe, are you sure your client took good care of the tattoo?
The machine would be the last thing I would consider being a problem. Look into all the above.