It's actually a more polite way of expressing it, indicating that it's only slightly off rather than incorrect entirely... Avoiding directly pointing out that your writing is in need of correcting is a way of helping you save face.
Paired with 'slightly', it definitely is how I would express such a sentiment to someone I don't want to hurt the feelings of (I'm a native speaker, AmE) in a casual setting (it's kind of slang).
I'm sorry, but I'm not used to hearing American English in everyday settings (not counting films) and I find it to be very rude-sounding. I grew up around British English (different versions, mostly BBC) and Indian English.
'Out of whack' sounds to me like 'crazy' which reads as rude to my eyes.
"Out of whack" means something isn't in perfect condition or isn't quite working right. As such, saying something is "somewhat out of whack" is a bit softer a critique than saying something is "incorrect". It suggests that it's generally good, but there's something a bit off that could use adjusting. To me as a native speaker, saying something "needs some correction" implies that there's a more fundamental error.
Sorry, if I mistranslated it; according to my dictionary "whack" means "harsh blow or bang " and if somebody calls my English "a harsh blow" or feels that it is a "harsh blow" then I think he/she wants to tease me or tell me that my English is beyond repair or sounds rather awful to him/her. Therefore I took it as an insulting statement. I never heared that phrase before and a teacher would have simply told me that you don't capitalize "manga" in English and the plural is not "mangas" like you say in German and the "boy's" "s" is supposed to be a genitiv not a plural (like I thought, because of the at least "two boys" in the story").
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Your punctuation and capitalization is somewhat out of whack.
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And I'm also a non-native English speaker.
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'Out of whack' sounds to me like 'crazy' which reads as rude to my eyes.
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There's more on the phrase here if you're interested: http://www.worldwidewords.org/qa/qa-out2.htm
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I'm not sure what you mean by this? You wrote it as genitive singular and they just corrected it to genitive plural.
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