I have that problem as well. When I type something, I know exactly what I want to say but I initially end up writing gibberish. Sometimes I type absent-minded rubbish when trying to think of something to say or how to phrase something, which I go back and reword.
Sometimes it happens when I speak as well, which has landed me into a bit of trouble a couple of times, as people think I mean something completely different.
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I'm sailing across Spectrum Sea, in my little boat.
The waters of the port were choppy. After I set off, there was a long, massive storm.
Years later, however, the sea calmed. I'm still on tranquil sea, but I'll never reach the Neurotypical Beach.