MacBook Air lock screen wallpaper stuck on random image?

Hi, I recently created a folder of photos on my MacBook Air called "autorotate" to rotate between different photos for my main screen wallpaper.

However, when logging in, on the lock screen where you have to type in your password to enable Touch ID, the wallpaper is always this one frame from a GIF located in a different folder "supergiant games." I removed the "supergiant games" folder from the wallpapers section of my settings, and even deleted the GIF off of my laptop, but the image seems to be stuck.

Does anyone know why this might be the case, or how I can adjust the wallpaper for just the Lock Screen background? Thanks!