Help - Aerated casting tea smells bad

Hi all - not sure if this is the right place for this question. I've been making aerated casting tea for a couple of years now, pretty regularly, about 2-3 times a month. I make it the same every time with good results and happy plants, 4 cups of fresh worm castings, 1/4 cup molasses, aerated in 5 gal for 48 hours. I just finished a batch casting tea today and immediately noticed something wrong with it. The color is off, instead of being dark brown it's a light brown/orange-ish color (like old coffee with cream) and there's a slightly unpleasant smell. On the castings bag a gooey stinky layer of muck has formed on the outside.

Any ideas on what happened so i can avoid in the future? Is the tea still useable? Maybe my bucket wasn't clean enough or had some bad bacteria floating around?

Thanks for your help and input

Seems like you would want to to guarantee the right organisms.
Something nasty must have snuck in this time.
Short of prepackaged organisms, maybe start with boiling water to steam and sanitize your vessel.
Maybe switch to a stainless steel stock pot.