Certified GKH Gardening Expert
Symptoms point to Polyploidy. This is just a fancy term that means it is a mutant with multiple sets of genetics in each cell.
Sometimes, when the cell is dividing mistakes are made. Instead of dividing into multiple copies of cells, they merge into a larger single cell. When this happens, you get mutations like this.
Enjoy it. It won't harm anything, and will make for some unique photos!
This article will explain polyploidy:
Here is an article explaining "sports" in plants: