Application Update issue

Hi Friends,

I have one application on app store which I just have uploaded with v1.0.

where I got one problem that the one xib missing the UITestfield.

so I updated the code and uploaded the application again on the app store(v1.1).

In both case application is uploaded successfully.

The problem comes here

I already had applicaiton installed on my iphone with v1.0

After that I have received the new updates and then I installed the application v1.1, however it was not showing me the textfield in the xib(screen).

Then I removed the application(v1.1) and installed it by downloading directly from app store and then it started working properly.

so I am not sure that when I tried updating application, why the changes were not reflected ?

AS there might have multiple users downloaded the v1.0 application and whoever does the upgrade might will receive the same problem.