HDRI preview bug

I tried to use different hdri with my other project to see what works best and then I noticed that it isn’t updating. I created new file to show what’s happening. Please have a look at the video…I used studio lighting preset and default flamingo environment. As soon as I changed refracted option to sky in environment panel the preview updated to hdri which I used with my previous file but I didn’t upload anything to this new one.

https://drive.google.com/open?id=0B0dE494tmFhMYlNvdFcwT3l0V0U (video)

http://www.food4rhino.com/resource/full-moon (hdri showing in preview)

Also notice how dark the image looks on the website

and how bright it is once I upload it to Flamingo. Is this normal? Can I make it darker somehow?