The only way to add a hue light directly to a ST hub would be to remove it from your hue bridge first. I highly recommend against doing this.
with your current situation, I recommend go to Menu > Settings > Linked services and removing the cloud-to-cloud integration. That will get rid of the duplicates.
That will leave you with the direct connection between the ST hub and Hue Bridge which is the best way to use your Hue lights.