Hue is a bridge, not a hub. 
So yes, I meant the SmartThings hub.
Anytime you move a device to a new physical position, or add a new device to the network altogether, you need to rebuild the address tables for the individual devices so everyone knows who their true neighbors are.
The device won’t use a new repeater if it’s not in its neighbor table, and it won’t be added to its neighbor table until you do the network heal. Which for zigbee means Taking the hub off power for at least 15 minutes, and then when it comes back on power all the devices will automatically rebuild their neighbor tables.
it can take a little while for this process to complete, but you should definitely see results after a few hours.
Hue Bulbs
A Hue bulb connected to the Hue bridge is using the ZLL profile and will only Repeat for other bulbs connected to that same bridge. They basically form their own mini net network.
But when you connect a Hue Bulb directly to the smartthings hub without using the Hue bridge it has to switch to the ZHA profile because SmartThings doesn’t support the ZLL profile. And at that point the bulb becomes a ZHA repeater for other devices on the SmartThings zigbee network.
If you map your Zigbee network using a third-party device you can see this. Many community members have done it. However, it appears that these bulbs are unreliable ZHA repeaters based on reported community experiences.