are you using a P3 monitor? also, premiere only understands rec. 709 rgb 0-255 not legal video range.
you could make a “fix it” lut. I use this free one.
https://sellfy.com/p/aQ1y/
next time BEFORE you grade,
uncheck davinci Use Mac Display Color Profile for viewers option in the settings:
for youtube either
1. upload prores
2. h.264 gamma fix
fixmyyoutube
https://f1.creativecow.net/10598/fixmyyoutube
cube iridas lut for burning in darker 16-235 from 0-255 for youtube upload. it darkens image, then youtube re-lightens again.
it doesn’t work with adjustment layers directly, you have to use it in the dropdown for the export in adobe media encoder. or you can NEST it first. its a premiere bug. also it needs to be copied in both premiere-lumetri-technical and adobe media encoder-lumetri-technical