How to make hitboxes that don't persist?

Log:
[2014.06.08-08.24.18:185][ 11]LogBlueprintUserMessages: Looked up savegame MainSlot
[2014.06.08-08.24.18:185][ 11]LogBlueprintUserMessages: MainSlot found - Loading
[2014.06.08-08.24.18:185][ 11]LogBlueprintUserMessages: MainSlot loaded - CAST SUCCESS
[2014.06.08-08.24.18:254][ 12]LogHUD:Warning: Failed to add hitbox named HB300 as a hitbox with this name already exists
[2014.06.08-08.24.18:254][ 12]LogHUD:Warning: Failed to add hitbox named HB250 as a hitbox with this name already exists
[2014.06.08-08.24.18:254][ 12]LogHUD:Warning: Failed to add hitbox named HB200 as a hitbox with this name already exists
[2014.06.08-08.24.18:254][ 12]LogHUD:Warning: Failed to add hitbox named HB150 as a hitbox with this name already exists
[2014.06.08-08.24.18:302][ 13]LogHUD:Warning: Failed to add hitbox named HB300 as a hitbox with this name already exists
[2014.06.08-08.24.18:302][ 13]LogHUD:Warning: Failed to add hitbox named HB250 as a hitbox with this name already exists
[2014.06.08-08.24.18:302][ 13]LogHUD:Warning: Failed to add hitbox named HB200 as a hitbox with this name already exists
[2014.06.08-08.24.18:302][ 13]LogHUD:Warning: Failed to add hitbox named HB150 as a hitbox with this name already exists
[2014.06.08-08.24.18:397][ 14]LogHUD:Warning: Failed to add hitbox named HB300 as a hitbox with this name already exists
[2014.06.08-08.24.18:397][ 14]LogHUD:Warning: Failed to add hitbox named HB250 as a hitbox with this name already exists
[2014.06.08-08.24.18:397][ 14]LogHUD:Warning: Failed to add hitbox named HB200 as a hitbox with this name already exists
[2014.06.08-08.24.18:397][ 14]LogHUD:Warning: Failed to add hitbox named HB150 as a hitbox with this name already exists