.ear files are not deployed correctly under multi instances environment

We have 1 CI and 3DI.

In one server there are 1 CI and 1DI.

and in the other 2 servers there is 1 DI each.

I developed a program with Webdynpro Java and deployed correctly.

But after that I could run the application in only the specific server.

For example I could run the applicaion in A,B server but not C server.

What's the problem?