complex geometry – What in Gods Green Earth is this?

I found quite possibly the strangest thing I have ever seen. I started with x^2+y^2=a with a being a variable I could set. I don’t know what persuaded me to do this, but I set a to 1.5 Root(x^3), which I don’t know the equivalent value of. I found out that when I plugged this into Desmos, the graph looked discontinuous. I decided to zoom in at the origin. I did this all the way down to a scale of 10^-108, at which I could see exactly what the shape was. Link: https://www.desmos.com/calculator/qyc3rfzidi. What caused this? is it a bug? What is the type of function called? It’s concentric circles sliced into exponential sections.