Hello gurwinder178,
Thanks for reaching out to Apple Support Communities. It sounds like you're having an issue with the apps in your app drawer on your iPhone. We're happy to help.
Since the issue started has a normal restart of your iPhone been tested or force closing the Messages app? If not check out and complete the steps below to help:
How to force an app to close on your iPhone, iPad, or iPod touch
Restart your iPhone
If the issue continues, test removing one of the apps from the app tray and adding it back. You can find those steps in the section "Manage iMessage apps" from the article here: Use iMessage apps on your iPhone, iPad, and iPod touch
Best!