This happens whenever you use a texture that has an alpha layer (transparency) on the backboard. The dice are partially transparent, so you end up with the well-known issue of “texture fighting” on your board, where the viewer isn’t sure whether to display the dice on top or the backboard on top. Even if your texture does not have any visible areas that are transparent, it can still have an alpha layer. If you are the original creator of the texture, try uploading it again without an alpha layer. The easiest way to do this is to save it as a .jpg (Jpeg) or a .bmp (Bitmap) file before upload. .png (Portable Network Graphics) will also work, as long as you know how to save it specifically as a 24-bit .png file (minus the 8-bit alpha layer that a 32-bit .png file has).