Hello,
Sorry to hear you are having issues. Need to know what Windows 11 version and OS Build number on both system? Please use Winver.exe to get these numbers.
Also, Just to make sure Start11 get properly install. Please try, uninstall Start11, reboot immediately (important), download latest version available in your account product download page: https://store.stardock.com/myaccount/products. Install it, reboot immediately again. Retest it and report back.
Thank you,
Basj,
Stardock Community Assistant.