A family of Microsoft word processing software products for creating web, email, and print documents.
Except it only happens in Word. Not in the browser, and not in any other app - so it's not the iPad doing it. Also, this issue has been experienced by people across all sorts of devices - only in Word. So it's absolutely Word that is doing it.
For what it's worth, when I changed the font, Word started behaving normally again.
I apologize: for some reason, I thought you said that you wanted to convert "i" to "I."
Which AutoCorrect options, if any, are available in Word when you run it on an iPad?
In Word for Windows (which this thread was originally about), AutoCorrect and AutoFormat As You Type can be configured in the AutoCorrect dialog box (File | Options | Proofing | AutoCorrect Options).