Spell Check doesn't understand what "Uncapitalized Start of Sentence" means.
While running spell check, Illustrator doesn't seem to understand that a comma is not the end of a sentence, or that the word following the comma is the start of a new sentence. See attached screen shots.
(running the version of Illustrator on Mac running OS 10.13.6)
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Please accept my sincere apology for the inconvenience. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.