Tapped Out app won't open at all

Posted this on another thread as I had this problem and fixed it in a similar way but to get to the point after wiping my ipad back to factory settings and setting it up as a new ipad with a new id I downloaded tapped out and when I launched it it came on signed into my origin account already and went straight to my town I have told apple about this but seems a big security problem as I pointed out to them I have sold old devices wiped to buy new ones so does it mean that even though u wipe the device it still saves your login details somewhere, its a bit worrying I think u can agree as someone else could download an app on it that u had and get straight into it as u