1/4 cup of rice not measuring to be 45g, turns out to be 30g
The measuring cups that come with rice cookers are not the same size as a US cup (or indeed many other countries' cup measurements). 

A rice cooker cup is 180 ml, a US cup 240ml, and in a lot of places it's 250ml. This is because rice cooker designs originate from Japan. 

You're getting 30g, which is 2/3 of what you expect. For a US cup, 3/4 would be right, and for a 250 ml cup, 72%. That's probably close enough given how much variability there is in packing rice into a cup, especially as grain shapes vary.