Never used a Zojirushi (probably one of the few east asians who do not possess an electronic rice cooker) but i would appear you used too much water.
I prefer to use the volume measure method as it is fool proof. 1 1/2 parts water to 1 part white jasmine rice, and FWIW, 2 parts water to 1 part white basmati rice (previously soaked).
If you want to do the depth method, I do seem to recall that the height of water in the cooking pot (with the rice) should be 2x the height of immersed white jasmine rice.