Why does the text in my PDF become invisible when I switch to another text field?

Question

I'm using Adobe Acrobat Reader DC to view a PDF file that somebody else created. There are editable text fields in the document that I can write text in, like this:

But when I switch to another text field, the text in the first field becomes invisible:

The text in the first field is still there, so if I switch the focus back to it, it'll still have the text that I typed.

Answer 1

I might be like 5 years too late, but you can Right click on the text box, click 'Text style', then 'clear formatting' and your text should stay in view.