Lumen white glitch, candle and sky problem

Hello, I have a problem with my lighting, my candles and my sky. When I’m in play and I get closer to my statue, we see spots of light like glitches (See the Gif StatueWhiteGlitch). We can see the same problem with my candles but in addition we see the square of the flame and I don’t know why? (See CandleWhiteGlitch Gif). My last problem is the sky, when I look at it and change my camera position, it cuts out. I have clouds and fog, I tried to change the settings of both but nothing worked (See the SkyProblem Gif). Thanks in advance and if anything is missing, let me know!
StatueWhiteGlitch
CandleWhiteGlitch
SkyProblem