Shadow appears when trying to edit text
Hello! I received a .pft document that I have to translate to another language.
I downloaded a trial version of Adobe Acrobat Pro, since this is something that I've never done before. I opened the document without any problems. The text have no shadow at all. Whenever I try to change the text, a shadow appears.
The document is confidential, so I can't share the hole document. I can however show some of the text:

This is before I'm trying to edit it. Let's put a 'x' in front of the letter:

And the shadow appears. The only way I can fix it right now, is to move the text, then mark the shadow, press delete, and move the text back to where it was located. Is there any easier way? Is there any way I can deactivate the shadows?
I really hope someone here can help me, because this is happening to all the texts in the document (20 pages), and it's really annoying.
I thank you in advance: Thank you!

