Two Sky Orbs With a Similar-Looking Stripe

The photo on the left shows a sky orb I photographed last night, October 10, 2016, a dry night. The photo on the right shows a sky orb I photographed on February 11, 2016. Both orbs have an identical-looking stripe. Both stripes start at the same position on the orb, are of the same length, and are rectangular shaped, with a straight end.