Can't Use Arrows to Navigate Text in Text Box

[Anson Hunter]

For some, but not all, text boxes, when I try to use the arrows to navigate
text within the text box, they instead move me to other text boxes in the
document. Not being able to use the navigation arrows to go to locations
within the text box makes editing very slow and cumbersome.

If I copy a text box that allows text navigation using the arrows and try to
edit it, I still am unable to use the arrows in the new box -- they just move
me to other text boxes.

Help!

Thank you.