PDF Form - Text Box displays completely different text when clicked into?

This is really strange. A form that my company uses on a regular basis has a large text box for notes.

On one specific copy of this file, the text box displays one set of text when viewing it after opening the file. But when I clicked into the field to copy the text to a different report, it switched to a completely different set of text related to a different job! I can't seem to access the text that is viewed at all. The only clue I have to what is going wrong with this is when I go in to Prepare Form, open the Properties/Options of this text box, and uncheck "Allow Rich Text Formatting", the viewed text disappears and the unwanted text is now the same for viewing/clicking.

I have never seen this issue before on any other copies of this file. I am including screenshots as I can not attach the file itself due to company restrictions. The top box is how the text appears at first, and the bottom is when I click in it to edit. After unchecking "Allow Rich Text Formatting", the bottom text appears in the box at all times.

Does anyone have any idea how this happened so I can avoid it in the future?