Mine are stuck on the same color and won’t change. Is there a way to fix it?

Get a new bulb and go down the line rotating it out with the old. I found that the 6th bulb was bad because it started to work as expected again.

Press button on controller (D) to change between the three different light settings: 1. Lights change from Red to Green to Blue 2. Lights show selected color (Red, Green or Blue) 3. Lights show White only