Why are the installed apps are uninstalled completely?

Here is what i am facing...
1. Installed an android app (Apptoid Store)
2. Uninstalled the above mentioned app by press n hold and delete
3. This app is not visible in app manager.
4. When trying to install the same app again, It says "Application already Installed"...

My question is that how the installed apps could be uninstalled completely?

Thanks

http://www.crackberry.com/if-youve-b...update-try-now

Thank you @conite, everything works perfectly fine after installing the update.


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