Responsive project plays half screen for some users but not others

Hello!  I am uploading new courses that others are creating; they are responsive projects.  When I review them, they play fine on all 3 of my pc’s (13in, 15in, 17in screens).  However, when I play on a different LMS, the course only plays on the left side of the screen with the slide counter showing on the right side of the screen.  Apparently this occurs for different users on both platforms the courses are being uploaded to.  Does anyone know […]