Personally, I haven't seen anything strange with the keyboard in Word 2010 or 2013. Since you see it not only in Word, but also in other programs, I don't think the problem could be caused by an option in Word.
Just to be clear, you are referring to the Up and Down arrows on the keyboard? Is NUMLOCK activated?
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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