Issues viewing some PDF files on mobile app

I have a number of files, all from the same publisher that open and read perfectly normally on my laptop version of Adobe Acrobat, but when I open the files from the mobile app, the text is altered and unreadable. In some instances it is just selected text, and in others the entire document is garbled. I have been in touch with the document publisher, and they are unable to replicate the problem.  Does anyone have any experience with something similar?  Thanks in advance.