My documents have unwanted box images on them

I am so frustrated!!   I have windows 10 using Firefox.  When I upload a document from MS One Drive or MS Word my document has boxes added at the bottom that I did not add myself.  In my example, after the word "today." there are two boxes that I DID NOT ADD IN.  I haven't yet done anything to the document (i.e., no signature boxes or anything), it simply uploads with these boxes.  Here is a partial screen shot:

Please help!