Changing measurement units from imperial to metric decrease max carryweight significantly, like half in my case.
Do you mean the numeric value for metric on screen drops to 2.2 times less than imperial?
As in carrying 200lbs maxes out your encumbrance, but mere 100kg does the same?
Or are you saying character maxing out at 220lbs maxes out at 50kg?
Can you provide screen shots of lbs and kg both please?
220lbs weighs the same as 100kg. All the items weights get reduced by same ratio.