Hello,
Sorry to hear you are having issues. I believe, it depends on how you pinned the application to the Start panel. If the updates application change location or change its name that will make your pinned shortcut lost its link. But, I am not sure how it moved/inserted into another group. Unless you pinned a Stardock Fences group.
It best if you could post a video showing us the issue as its happening.
Thank you.
Basj,
Stardock Community Assistant.