Creating new database from a backup of another database on the same server can cause any problem to parent database?

There is a whole lot we dont know about your application and we arent going to be of much help since we dont know what it does, have access to your server, your code, or any way of replicating what it is you need help with. Think of it this way, you've just gone into the Doctor and told him "i hurt" expecting a diagnosis without letting him examine you. Thats what you're doing here.

You just need to do the basic debugging of your app and I am sure you will find the issue. If its not "failing" in the sense that its not throwing an exception then you need to add logging to your app.

Add log messages that are relevant to your application, don't create a lot of "noise" and cause yourself issues when trying to read what happened later. The idea here is that hopefully you'll be able to find where in the process it stops running...then being able to fix whatever the problem is.

Review your code and make sure you aren't "eating" any exceptions causing them to become hidden in efforts to keep the application running.