Grub menu appears on top of grub customizer menu and background image

Starting today, on top of a fully up-to-date version of 17.10 and Grub Customizer, when booting, first the background image and colored menu as set in Grub Customizer appears and then immediately, the grub menu appears as it would without Grub Customizer, but only occupying the upper left eighth of the screen. The menu still works correctly, so it's only a cosmetic issue. I could just delete Grub Customizer but I have grown accustomed to my splash screen at bootup and would like to retain it.