Drag/drop of local repositories does not work correctly

I've organized my local repositories into folders in SourceTree. If I want to re-order the local repositories inside a folder by dragging and dropping a selected item onto another position inside the folder, then this item is placed outside the folder afterwards.

My original view looks like this:

• Folder A
  • Repo A1
  • Repo A2
  • Repo A3  <- This one I want to move up before A2
• Folder B

After I've dragged A3 and dropped it to its new position the view looks like this:

• Folder A
  • Repo A1
  • Repo A2
• Folder B
• Repo A3  <- A3 is placed outside folder A now