Why the performance of neural network is bad with larger input?

Hi,i create neural network for classification using nnstart.First i used an input with 9*222 matrix and i got this confusion matrix after training

Then i tried with input with a size of 9*989 but i got this confusion matrix

I want to know why the performance is bad with larger input?should i modify something because i tried to change the number in the hidden layer but it dosen't improve ? Please i need some help

[Greg Heath]

Insufficient information.

Hope this helps.

Greg