It's a bit hard to tell much from the small pictures, but there are a few explanations that make sense.
First, the lighter card could be faded. But the red is very similar, and red usually fades first.
The next two are related, and may even be combined. I checked a few Goudeys, and the blue is done in two passes, a light one and a dark one.
Second, and this is common, the inks were mixed by hand and can vary some depending on how the press operator interpreted the recepie for the exact shade desired. Both blues are lighter than usual.
Third, the dark blue may be underinked. The operator can control the amount of ink applied to the plate, and for some reason may have run it light that day.
(The water wetting the plate can also be adjusted, with similar results if a bit too much is used. )
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