Question about arrays and list

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C#

Hello I am getting an IndexOutOfRange exception when filling the values of the arrays below from a stored. In total the list contains 36720 items which I have output to .csv to confirm. Any help please as I cannot tell where I am having an out of bounds error

int inputToMain = 300;             
static int inputToHidden = 120;    
static int hiddenToOutput = 6; 
double[][] arrayWeightToHidden = new double[inputToHidden][];       
double[][] arrayWeightToOutput = new double[hiddenToOutput][];

public void TestSample(List<Double> storedWeights)
        {

            for (int i = 0; i < arrayWeightToHidden.Length; i++)
            {
                arrayWeightToHidden[i] = new double[inputToMain];
            }


            //fill
            int h = 0;
            for (int i = 0; i < inputToHidden; i++)
            {
                for (int j = 0; j < inputToMain; j++)
                {
                      arrayWeightToHidden[i][j] = storedWeights.ElementAt(h);
                      h++;
                }
            }
 


            for (int i = 0; i < arrayWeightToOutput.Length; i++)
            {
                arrayWeightToOutput[i] = new double[hiddenToOutput];

            }

            //fill
            for (int i = 0; i < hiddenToOutput; i++)
            {
                for (int j = 0; j < inputToHidden; j++)
                {
                    arrayWeightToOutput[i][j] = storedWeights.ElementAt(h);
                    h++;
                }
            }
}

part of the storing method

for (int i = 0; i < inputToHidden; i++)
          {
              for (int j = 0; j < inputToMain; j++)
              {
                  returnOutput.Add(arrayWeightToHidden[i][j]);                  
              }
          }
          for (int i = 0; i < hiddenToOutput; i++)
          {
              for (int j = 0; j < inputToHidden; j++)
              {
                  returnOutput.Add(arrayWeightToOutput[i][j]);                  
              }
          }