Daystate Alpha Wolf magazine question

I purchased the latest model used Daystate Alpha Wolf that came with one magazine. I just purchased an additional Daystate magazine that seems to work differently.

The magazine that came with the rifle allows me to cock it using the side lever after the magazine is empty and then fire it. The new one locks up the side lever half way after the magazine is empty which is preferable.

Anyone know why the magazines are functioning differently?

Thanks in advance.
 
I purchased the latest model used Daystate Alpha Wolf that came with one magazine. I just purchased an additional Daystate magazine that seems to work differently.

The magazine that came with the rifle allows me to cock it using the side lever after the magazine is empty and then fire it. The new one locks up the side lever half way after the magazine is empty which is preferable.

Anyone know why the magazines are functioning differently?

Thanks in advance.
one of them is designed to prevent double feeding a pellet... not sure if you have one old and one new model.