I am running Groupy 2.12 and Windows 11 23H2 22631.2861.
I have a group setup to launch three Steam games and keep them grouped together. What happens when I open the group is that two of the three games appear grouped together and then a third game (not from the original group) opens in a separate window.
The game that fails to launch has the path: E:\Games\Steam\steamapps\common\Territory Idle\game.exe
The game that launches instead (and opens in a separate window) has the path: E:\Games\Steam\steamapps\common\Grim Clicker\game.exe
Is there anything else I can do to help you solve this problem?