Sorry to hear you are having issues. If you have Start11 V1.24 you should have notice that when you turn on enhance taskbar your Start Button will not be able to be in center as a message will popup when you turn that on. Refer to screenshot below. If you prefer the Center start button, than, you just need to disable enhance taskbar, click the restart explorer. The Start button should be back in the center. If not check again your your start button setting.
Stardock Community Assistant.