Chick with sick poop

[packmommy]

I have my ten week old chicks in my basement because of unseasonably weather. Foot of snow, highs in 30s, lows in 20s.
I moved them to another enclosure to clean their brooder space, and found this.
I have 5 chicks and am now trying to figure out which chick or chicks it is. There were many normal poops in there too.
they are eating Manna Pro Chick Starter, as they have been from the start.
there is an unusual odor to this poop also.
the other chicks are walking in it. Anyone seen this? What worked for you? Thanks

 

[NatJ]

I don't see anything wrong with that poop.

https://www.backyardchickens.com/articles/cecal-vs-regular-poop.75555/
Here is an article talking about "cecal poop" from chickens, which is what I think you have there. It's normal & healthy, smelly, and there are some comparison photos in the article to help recognize it.