If you are using PotPlayer, change to MPV and see if that displays correctly
Check your OBS/other recording software video options, the source has to be Full color range and BT.709 color space as well, I know you said Premiere it looks right, but still try check that.
Check the Output - Video tab, the color range is supposed to be Full instead of Limited
Try 8bit instead of 10bit, both set in recording and Premiere export.
Thx, turns there's another setting in Premiere that need to be set to 8bit in addition to the one in Voukoder. Just weird the same encode settings with Handbrake doesn't have the problem.