NumPy random seed produces different random numbers

I run the following code:

 np.random.RandomState(3)
 idx1 = np.random.choice(range(20),(5,))
 idx2 = np.random.choice(range(20),(5,))  
 np.random.RandomState(3)
 idx1S = np.random.choice(range(20),(5,))
 idx2S = np.random.choice(range(20),(5,))       

The output I get is the following:

idx1:  array([ 2, 19, 19,  9,  4])  
idx1S: array([ 2, 19, 19,  9,  4])  

idx2:  array([ 9,  2,  7, 10,  6]) 
idx2S: array([ 5, 16,  9, 11, 15]) 

idx1 and idx1S match, but idx2 and idx2S do not match. I expect that once I seed the random number generator and repeat the same sequence of commands - it should produce the same sequence of random numbers. Is this not true? Or is there something else that I am missing?