When I move the cursor upwards, the whole line (including the number) shifts one character to the left. The GIF explains it the best.
I'm using Neovim installed in Windows but opened through WSL running on Windows Terminal. This doesn't happen if I open Neovim directly from Windows, only when I open it through the terminal. I've tried some simple fixes - turning off themes and disabling numbers, but I can't think of how to troubleshoot this.