Why does a spring compress differently with 1000g versus 500g?

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    Hooke's law Law
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ConquestAce
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How come a spring with applied weight of 1000 g goes down 9.8 cm but the same spring with applied weight of 500g goes only 3.7 cm down?

This is from my own lab that I preformed, and I need help in explaining why this occurs. I searched online but didn't get any clear answers, my only assumption at the moment is that k constant is the reason why this occurs, but I am not too sure.

The K values for the same spring is different when I calculate it, and I am confused on why that happens.
 

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Obviously the spring doesn't follow Hooke's Law completely. More than likely it is following Hooke's Law for small loads but it starts to yield at higher loads.
 
An interesting experimental followup would be to take the same spring and put 100g, 200g, 200g, ... 900g on it, measure the amount of extension for each, and plot a graph. Does it start out as more or less a straight line, and then start to curve with larger weights, or does it curve all the way?