Wow, I see I'm not the only one! I really think it's from liquid detergent, at least in my case. It never happens until I try something different, which happens to be liquid.
Good idea to contact the manufacturer. Mine is a Whirlpool Duet Steam.
I will also dry dish soap on existing stained clothes.
This bugs me that I can't use a liquid detergent. It seems like that is where the most options are for HE!
Thanks for the ideas ladies!
DS1: Jacob 8/5/2007
DD1: Annabelle 11/30/2009
DS2: Jonah 6/3/2013