iPhone X camera takes very dark photos when using manual exposure

Hello,

Last night i was at the gig taking photos with my X first time in very low light, i lowered the exposure so the stage lights won't ruin my photos. So i did what i always did with my 6s and the photos look way too dark with X.

I did this small screen capture video to show the problem https://www.dropbox.com/s/ld59gvvr05q5bta/Video 18-11-2017, 14.07.42.mov?dl=0

If i do that same very low exposure with my 6s or iPad Pro, i see dark photo, as i see on the screen and not black photo.

If i use different camera app everything works like expected, it's only affect to Apple own camera app.

I didn't find anyone having similar problem, but i think most people doesn't even use those manual exposures so it might be hard to notice.

I wonder If it's been like this since i bought it or did newest iOS update did this yesterday

This is really bad because for me manual exposure is so important, i wouldn't want to send this phone to repair, but i tried everything, hard reset and erased the phone without any luck.