My guess would be lensflares. You do have quite some reflections there. Look at the // pattern. It's very visible in the 1st one. There's a ghost of it right next to the antenna(?) of the building on the right. The angle in the 4th is different, you can see that in the ghost of the // pattern which has shifted to the point where the building on the right starts tapering to the top. On the other 2 where that pattern isn't visible, you're seeing ghost/reflections of the moon.

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