Why is There Bleach in Our Dishwasher Soap?

Before I started making my own dishwasher soap I tried to get soap that would properly clean my dishes, but one that had less chemical ingredients in it as well.  I found this one and since I was in a hurry I just grabbed it.  It is Palmolive brand and since it is phosphate free and eco friendly I thought it would be safe.  At the time, I didn't even think about looking at the ingredient list.

Recently I spilled something on my stove and nothing was cutting through the grease so I tried this soap right on the stove.  I grabbed  towel and scrubbed it.  After washing it, I realized that my towel was stained!  THIS DISHWASHER SOAP BLEACHED MY TOWEL! WHY is there bleach in our dishwasher soap????

I checked the ingredient list on the back and there was none.  I tried researching the ingredients online and couldn't find the full ingredient list but I did find that there was ammonia in there. This is a problem.