No, it’s one of those right/wrong differences. I changed my mind about how to structure the sentence—from “I don’t think X is quite right” to “I think X is not quite right”—and failed to remove a word I should have removed. (I seem to be having trouble with negatives at the moment: while trying the last sentence, my fingers attempted to add “n’t” to both “should” and “have”!)
No, it’s one of those right/wrong differences. I changed my mind about how to structure the sentence—from “I don’t think X is quite right” to “I think X is not quite right”—and failed to remove a word I should have removed. (I seem to be having trouble with negatives at the moment: while trying the last sentence, my fingers attempted to add “n’t” to both “should” and “have”!)