On Arch Linux, I installed albert (from AUR) and picom as the compositor. I am using i3 as the window manager.
When I bring up the albert window, it is surrounded by the ghost of a window in the background. So for example if I open a browser and terminal in the tabbed layout, with the browser focused and the terminal in the background, bringing up albert will also show a ghost of the terminal around the albert bar. This looks like you took a screenshot of the terminal, set the alpha to 0.1-0.2, and used it to fill the space around albert. Before I installed picom, this space used to be black.
If there is only one window open, the ghost is instead of my wallpaper (which is set up using feh).
What's the problem here and how do I fix it?