What's the problem here? It always does this with fuchsia and alike colors. The picture looks so fake.
Simple answer is, the color in the flowers is out of the recording range of your camera.
Your camera's image processor (software) takes the raw data from the recording sensor and assigns it to a specific RGB color space (sRGB most likely). When it encounters a color it can't assign it coerces it to the nearest possible color. The result is an apparent loss of detail and posterization. Welcome to the digital world. Every color must be a number. The range of available numbers is pre-defined and you tried to photograph a color outside that range -- can't happen.