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!
Not my native language, but the one I speak the most is (American) English.
So many homophones-words that sound the same but are different in meaning or spelling such as knight/night, altar/alter, ail/ale, isle/aisle/I’ll.
Also homographs-words with same spelling but different meaning and/or pronunciation like minute, bass, capital, wind, moped.
So confusing for people trying to learn English and also for people that actually speak it
I can’t speak for all native English speakers, but in my experience we’re very accepting of imperfect grammar from non-native speakers because we know how crazy this language is.