As a university writing instructor, whenever a professor tells students that they need additional help, those students should immediately make an appointment with the professor to find out exactly what the problem is. In your case, if you had done this, your professor could have shared with you how your documents were appearing on her end, and you could have worked together to find a solution. I know this can be a challenge if your course on online instead of face 2 face (F2F), but this is what you have to do.
I am not familiar with the learning management system (LMS) you are using; however, I can tell you that other LMSs have the same problem. At my institution, we use Canvas, and sometimes, submitted work gets screwy, even with simple Word Docs. Sometimes, the indentation of the first line of a paragraph ends up not indented. Just this past semester, students uploaded an extensive PowerPoint for a collaborative assignment, and it seems as if Canvas could just not handle the size of the document--Canvas altered ALL of the formatting--I mean everything: the font, the shapes, the pictures, the reference list. Canvas also does to play well with Apple devices. Students who use PCs seem to have less problems with the LMS.
I would be really proactive with your next set of professors.
