Is my Miso paste bad?

I wanted to make miso soup. I unfortunately don’t have access to a car at the moment, so I thought I’d look to Amazon since they have things like Amazon fresh now.

I tried putting some miso into water to taste the broth. And I ended up getting this unpleasant apple cider vinegar-like taste. I am unknowledgeable of what miso paste should look like. So I’m wondering if this was human error, or is something wrong with the paste itself?

I noticed a dark patch in the corner so I included it in the photo