Whirlpool TUD6700 doesn't drain final water load.

If your pump or something is not working it wont drain, but if only the final drain wont complete its most likely normal

if the water level is just below the heating element then im sure its normal, because that is normal for whirlpool dishwashing brands, its due to long hoses or height of hoses, also low water pressure

if not id go with a timer/pcb