Yesterday Microsoft released some new updates:
KB3081448 : Cumulative Update for Windows 10
KB3081449: This update improves the Windows 10 out-of-box experience (OOBE)
KB3081452: This update makes improvements to ease the upgrade experience to Windows 10
After installing these, KB3081448 might have added the option to disable automatic Store app update for Windows 10 Home users.
Earlier Windows 10 Home users didn’t had any option to disable the Store app updates. So they couldn’t make out which apps got updated.
Now open Store App > Settings will provide the option Turn off ‘update apps automatically’.
So if you are Windows 10 Home user , check you get the latest updates and turn off the Store app updates automatically.