Mine is people who separate words when they write. I’m Norwegian, and we can string together words indefinetly to make a new word. The never ending word may not make any sense, but it is gramatically correct
Still, people write words the wrong way by separating them.
Examples:
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“Ananas ringer” means “the pineapple is calling” when written the wrong way. The correct way is “ananasringer” and it means “pineapple rings” (from a tin).
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“Prinsesse pult i vinkel” means “a princess fucked at an angle”. The correct way to write it is “prinsessepult i vinkel”, and it means “an angeled princess desk” (a desk for children, obviously)
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“Koke bøker” means “to cook books”. The correct way is “kokebøker” and means “cookbooks”
I see these kinds of mistakes everywhere!
It is true, at least here in Norway: https://no.wikipedia.org/wiki/Den_nye_tellemåten (“The new way of counting”).
Our parliament deceided in 1949 that 21 should not be pronounced as “one-and-twenty”, but as “twenty-one”. It was because new phone numbers got introduced, and the new way gave a lot less errors when spoken to the “sentralbordamer” (switch operator ladies).