I'm not sure that's worrying. Remember, this is hardware. Hardware takes time to turn on and get into a steady state. Many hardware random number generators are

I'm not sure that's worrying. Remember, this is hardware. Hardware takes time to turn on and get into a steady state. Many hardware random number generators are based on thermal noise. But in order to get in the correct range for the values to flip, you need to wait for the circuit to warm up to operating temperature.