{Q} Weird Problem - Apps starting Automatically after installation / update topic

I am facing a weird problem,
Apps are starting automatically after installation or update.
when ever i install any app through playstore or by using apk, the app starts automatically even if press "Done" button rather than "Open" button.
Same is with updates if any of my app updates it starts automatically after update.

What can i do to solve this problem?
i have not rooted my device and i dont what to factory reset. i have done "wipe cache partition" but it didn't helped, please suggest any solution that i can try without rooting.

Thanks in advance....