hi Kayleigh
I'm not sure if i understand.
It does sound like the way it should work.
An active pose is indicated by a filled square. There can only be one active pose at a time.
If you want to select a pose, you just set it by cliking the according button, and the square for that pose will be filled.
If you want to select a different pose, you just click the button for it and now that square will be filled and the other will be empty again.
If you want to turn the posing functionallity off, just click the button of the currently active pose, and its square will no longer be selected.
Thanx in advance
KittyCatS