Some unwanted blocks keep getting back even after delete

When i start a new drawing 2 unwanted blocks are in the sheet format. When I edit the sheet format delete the unwanted blocks and then save as sheet format again. You would think when starting a new drawing again all would be be ok but NO, the blocks keep getting back... (see attached pictures.) What can I do so the blocks will not come back?

SolidworksDrawings And Detailing