Distributed content moving or disappearing- Class Notebook

Hello, we have several teachers who are distributing content to students and some of the class will have issues. This is happening across the district with various teachers. The teachers make the document part of the background, but when students click on it, it disappears or moves the cursor to the far bottom of the page, etc. This is happening enough where some teachers are using other resources other than Class Notebook. Anyone else seen this? I thought maybe an extension on the student Chromebooks or network connectivity during the sync? Any other ideas?