I've had it happen when using Copy & Paste to hill out notes fields too.
One indicator to watch for, if your autofill or suggestion menu that appears when filling out the field seems to have two or more choices that look the same, it's a good bet that one of them has at least one trailing space (meaning there is at least one entry you need to go back and fix).
-Tom
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I prefer the company of people who disagree with me for the right reasons over the company of those who agree with me for the wrong reasons.