You said something you didn't intend to
Your phrasing there means something else
You're not saying what you want to
That's not what you want to say (to convey that)
That means something different from what you think
You're not getting across the idea/meaning/what you want to
2019年6月20日
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Use "than" rather than "from".
Your words came across differently than what you were trying to say.
OR Your words came across differently than you thought.
2019年6月20日
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That all looks good. "Your words came across differently from what you were trying to say, because of the grammar (or "grammatical") mistakes you made." (You don't really need "in the sentence".)