problem with Multi-scene project.. Pls help..

My multi-scene Project totally comprises of 16 Scenes where I used some buttons to navigate in between. All of them are getting played successfully, if I play them individually. But when the project is tested as a whole, though navigation between all those scenes is possible, but exactly when it gets to the last 4scenes(13,14,15,16), the particular scenes are stopped playing at the first frame. I tested these scenes individually, they are getting working successfully.

One more thing is that, If I just reorder the scenes in the Scene window, and, test the project, exactly the last 4 scenes are not getting played. (stopping @ the first frame).

Pls, Pls, Can somebody help me to sort this out. I know it is not preferred to work on multiscene. but, It is mandatory for my project. Waiting for a solution.. Thank you so much friends.,