App store icon shows 21 updates but no updates avail
I have an iPhone 5 with software up to date. The app store icon shows 21 updates available but when I open the app store it has "update all" under intensified. I tried syncing with my computer (iTunes), turning off and back on... etc. The icon remains with the 21 showing in the upper right corner and the 21 also shows on the updates tab along the bottom of the screen when I open the app store but still "update all" is under intensified. How do I fix this?
iPhone 5, iOS 8