In iPhone X, images taken in “VIVID" mode get converted to ORIGNAL mode automatically. Anybody else facing this issue? Any solutions for this?

I generally click photographs in vivid mode. I was doing the same in my previous iphone 6. I've purchased iphone X, two months back and have since noticed that in this phone the pictures I click in vivid mode are converted to original mode automatically after about 1 day's time (my observation).

I use the latest software iOS v11.3.1

PS : Raised a case with apple support but didn't get any resolution.