The moving from indoor practice to outdoor pitch is one of the biggest problem in cricket. The differences is so huge that many players hate to practice indoor as it makes them shaky rather than steady. They prefer no training than to have indoor training.
Why it happens?
Most of the time it is due to variation and lack of adaptation. But if you spend 8-12 months in indoor practice, you would have adapted to the change. You would have started quite differently.
Here are some of the differences
So, if you bowl out swing, your indoor back of length ball pitching on middle, and leg and hitting off stump becomes an out slow short ball down the leg side.
Is fixing the indoor net practice possible?
Yes the problem can be fixed. Primarily, it is all about attitudes. The indoor net problems must be seen as a challenge to overcome them instead of taking them as an insurmountable barrier.
Once you go outdoor, it is better not to go indoor again. There are many ways to manage the problem, but the most important is adaptability.