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!
The funny thing is, that most of the world uses commas as decimal separator and comma is the preferred decimal separator by ISO. But instead, in English speaking countries, the period is used as the decimal separator. Actually it comes from the original decimal separator, that was used in the British Empire called ⟨·⟩. When they were changing units to metric, ISO didn’t recognize interpunct as a decimal separator, because it was too similar to the multiplication sign used in other countries. So after some debate in the UK, they’ve adopted the period, because the US was already using it. From the British Empire, South Africa instead adopted the comma.