HPA Tank Fitting Question

[Paintball Freak]

I'm completely new to HPA Tanks, and I was just wondering, does what you see in the pictures look normal?

Example 1:

Question: Why are the threads from a CO2 Tank and an HPA Tank different?

Picture:




Example 2:

Question: Why doesn't the Tank fit all the way into my CP ASA?

Picture:




Any intelligent advice would be appreciated, Thanks in advance! = )