That could happen if the backs were printed first
Or if they printed backs on one press and fronts on another at the same time and swapped piles later.
Which sort of makes sense if they had a bunch of mistakes to fix. They'd done a bunch, stopped and while making the new plates simply went ahead and printed the backs.
There are lots of reasons to do stuff like that. There are a few cards from a number of different sets and it's hard to spot/prove where the normal order of colors wasn't followed. Some 81 fleer star stickers have the black printed before the blue on the front. Black is almost always printed last. If you have a stack, they'll be the light blue ones.
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