Screensaver chopped in half with dual monitors

Hello,

When enabling a custom screensaver (an mp4 file) on a dual-monitor setup, the screensaver appears as though it has been chopped in half on each monitor (showing the desktop behind it on preview or a black screen), and fails to animate properly. I do not experience this issue when using Windows's default screensavers, and it has persisted through an upgrade to a computer with a much higher quality graphics card (nvidia GTX 1660 Ti). Is there any remedy for this problem?