Higher Contrast on Exported Clips.

I'm new to all of this, so any explation is appreciated.

I've been using Pr mobile for past few days and I noticed, when a clip is exported in 4K it has more contrast than the preview in timeline.
It looks same to the preview in timeline only when exported in 1080p.
(which was originally shot in AppleLog, 4K and color graded inside the app, LUTs applied)

Is this a normal behaviour when exporting in 4K?
for the record, my app is up to date.

Thank You!