Strange thing about De Steno Games

Hi.
I know the De Steno Games app hasn't been updated but it worked fine with IOS 8.
Well I wanted to play them a few weeks ago and I am on IOS 9 now. On my phone the game won't open it just takes me back to the home screen.
But it shows on the app switcher.
So I gave up trying to open and play.
Now I'm not really surprised it stopped working because it hasn't been updated in a while.
But last night for some reason I decided to try and open De Steno Games on my iPad and it's on IOS 9 the latest one like my phone.
Heres the strange part.
De Steno Games opened fine and I was able to play the games on my iPad.
Just thought I would throw this out there for everyone.