I have no idea how many clan applications the app has eaten. Just did another one today. Makes sense if they joined another clan, but sometimes they are already in a clan (getting applications from opposing clans in this war haha), so I don't get how it disappeared. Not sure if you can actually cancel an application.
Thanks. I had no idea you could change the platform in the corner. I noticed it always said xbox, but didn't know it was clickable.