Fillable form printing doubled text

I created a fillable form that is being used as an application to a training program. We have just started using this form, and have gotten two returned. When I view the files that were returned, it looks ok, but when I go to print it, we get the following error:

An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem.

Then, the document prints but some of the fields have duplicated text (so it appears like a second identical set of text is overlapped, but ever so slightly off center. So it gives a "double vision" effect).

This double vision effect happens with some of the fields, but not all of them.

Any idea what might be going on here? This fillable form was saved as a Reader-enabled document and I don't know what program was used to fill out the forms. Is this something on the user side, that they maybe used a non-acrobat program to fill out the form and it is corrupted? Or is there a printer setting we need to change OR did we set something up incorrectly with the fonts in the document itself?

Any help is appreciated!

Thanks