You can get reflection from the air-glass surfaces of any/all of the lens internal surfaces, especially noticeable when shooting in high-contrast situations like lights against dark sky.
This happens in movies a lot, used for visual effect with multiple images of the sun, for example.
There are digital UV filters on the market, big $$, which are vastly better in terms of surface reflections and may reduce any effect like this from the filter, but then you still have to deal with the lens internal reflections.
Go to a local reputable camera store and ask to see a non-digital UV and a digital UV side by side, Helios, B+W, Promaster (these are VERY good, BTW), and Hoya are good choices, they may have any or all of these depending on how big the store is. The difference in transmission and reduced reflections from the surface of the filter is dramatic.