Corrupted text when pasted into form field

I have pasted plain text into two fields in my document and it pastes as individual question marks in rectangles. You will see in the bottom field, I already have some red text entered into the field. If I continue to type, it will type correctly but if I paste text from the clipboard (plain text, or formatted text) it appears as missing characters. I've been using this form for several years but today, it started doing this nonsense.