The lightening of color could be due to sun and heat, even early in the morning.
We don't know how it was grown before you got it. Most of the time Vanda seedlings are grown in much lower light than adult plants; it is better to give a little less light than risk sunburning such a small plant. It is not big enough to flower, so the high light is not as necessary as it will be later.
I might suggest either putting some sort of sheer fabric between that plant and the sun, or setting it behind the Cattleya so it doesn't get the sun directly on the Vanda. Or you could have even a very small fan on the plant. People here have posted photos of using computer fans on their orchids. They are powered by transformers of the type used for electric shavers, and other small appliances. Cut the small plug that connects to the device from the transformer cord, twist one wire onto each wire of the computer fan, and cover the junction with a wire nut or electrician's tape. You can even have it on a timer.
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