Sometimes apps start up two instances at once


When I boot into i3wm, apps like Firefox, Dolphin & sometimes even Kitty start up twice. It doesn’t matter if I use a polybar launcher, rofi or a terminal command to start them. Keyboard and mouse are definitely not faulty & it’s not like hitting enter twice in terminal would execute flatpak run… twice.

What could be causing this? (the issue does not occur in KDE or Hyprland)
I installed i3 with the Endeavor install script & it’s been doing this since day one, way before I went heavily into customization.