Why is there very little water in the washer tub during a cycle?

This is normal operation for this HE low-water washer — the load will not be completely underwater. The washer automatically senses the load size and adds the correct amount of water for optimal cleaning, so you will not see a basket full of water as with a traditional agitator-style washer. Do not add more water to the washer, as adding water lifts items off the washplate and results in less effective cleaning. (Page 15)