Garageband randomly downgrading itself!

Hi there, I have a 2012 13" Macbook Pro with Yosemite, and I have Garageband '11.

...or so I thought.

On a few occasions, when I try to open a song, I get this "This some was created in a later version of Garagband" error...even shortly after I was just working on the same song. I check my Garageband and see this:

This is literally the same day...like..not even hours apart. When I rebooted my computer a couple of times, it reverted back to '11 and my song opened again. What is going on here? Garageband is literally downgrading itself at random.