My sister and I learning to tattoo together. We use a rotary pen and an okey style coil machine. Well the pen for some reason won’t tattoo on the softer tissues of our skin. It’ll only tattoo on the more boney surfaces. We were putting a rose on my shoulder and it worked well until we got to the front part where it wasn’t as boney. It’s just not depositing ink into the skin on those softer parts. Anyone else have this problem? Any ideas what it could be or why it’s doing that?