Ginger Vinegar
I accidentally made ginger vinegar! I saw a mother forming in one of my jars of ginger bug that I left unintended, so I looked it up. It's a thing! Here is a website that tells about it. She did pretty much the same thing as me. Mine looks like hers. I haven't tasted mine yet. I wanted to be sure of what it was.
https://thethingswellmake.com/how-to-make-ginger-vinegar-from-a-homemade-ginger-bug/