iPad Pro files app disappearing portions of pages

Today when I save a multi page document to files app on my 4th gen iPad Pro, and begin scrolling through the pages, some pages have blank sections and some pages are completely blank. Those pages then stay blank every time I try to view them. I use my Apple Pencil to write in violin fingerings. Today after writing in some fingerings , I closed the file, then went back to it and only the fingerings showed up (that I hand wrote with my pencil) and the music itself is blank. Older files on my iPad work fine. My iPad has latest operating system, and I’ve tried shutting it down and turning it on again, also tried uninstalling files app from iPad and then reinstalling. Hasn’t helped. This also occasionally happened today when I put my hand on a page, such as resting the side of my hand when writing with Apple Pencil, or even just touching a page. The same files viewed on my iPhone and iMac don’t have those problems, they are intact and don’t have blank pages, it only happens on my iPad. Thanks for any advice!