I would also suggest that you post some pictures of what you are seeing. It should help give a better idea of what you are describing. That said, I would mention that captive animals often lose some of their color over time. This might be due to artificial lighting and/or diet. However, this would seem less likely if they are long-term captives/captive bred. If you aren't already doing so, they might benefit from natural sunlight provided in an outdoor enclosure.

Perhaps it is even related to the age of these particular animals. Older animals also tend to lose some of the brighter color they had as juveniles and young adults.

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