The sudsing makes the unit leak, and it will do so right thru the water float stem.
Your water is too soft and you should try tablet detergent instead of what you are currently using to cut down on sudsing. Dishwasher detergent is desgned to work in semi-hard water (4-11 gr.) If it is introduced into conditioned water, it will oversuds. In an ideal situation, there will be no sudsing whatsoever in a dishwasher. The detergent is only supposed to suspend the grease and food soil until it can be drained away.
Change and reduce the detergent you use and check for better results.