Tom I had a similar experience in 2018 with albino red covers. They were stunning coming from the supplier who had imported them and QT them before reselling. Over the course of the next few months they faded out to a peach color. I was very disappointed cause they were crackin fish when purchased, and expensive. In the same purchase I bought 2 red melons. They kept their vibrant red color the whole time I owned them. I thought it was just related to the strain at the time.
The red melons are in the left of this pic and the red covers middle towards back…
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At my age, everything is irritating.
That my friends is why I'm a wild Discus color guy through and through, no bubblegum colors for me...