Why is the update button in "App Store" app opening the app instead of updating it?
Go to Settings -> iTunes &amp; App Store -> AppleID -> Sign out.
Close the App Store app (double-click home button, swipe up on App Store), and restart the phone -- but instead of holding the power button and shutting down "cleanly", hold the power and home buttons until it powers off.  Power it back on.
Settings -> iTunes &amp; App Store -> Sign In.
See if you get the same results.


If that doesn't do it, try deleting the affected apps, then shutting the phone off cleanly, then starting it back up and re-installing the apps.