Observed a stationary ball of fire sitting on the water about 30 plus feet in diameter

My wife and I were sitting on our deck looking out at Lake Chelan when we noticed a bright light sitting stationary on the water. The light looked like a giant bonfire in the middle of the lake but without the smoke. The light was orange and yellow and changed shape as we watched it, almost like a flame changing shape as it burns. This light appeared at the same time, and in the same place, two nights in a row. I thought it was a reflection from the sun but the sun was setting in the west and we were looking south. After 20-30 minutes the light disappeared.