Bests & Worsts Reviews from Amazon

I bought this lens for my Sony A6000 with a Sigma 30mm E-mount lens. I always use a UV filter for protecting my lens, as I travel extensively with my camera. During the daytime, the UV filter works well and provides no noticeable degradation of image quality. However, at night this ghosts like CRAZY. I was thinking there was something wrong with my lens initially, but then decided to take the filter off while shooting. I've attached the photos.