Unable to refund Warrior Titan Ascendency for Colossal node

When I speak to the hooded one or Dooryani I can refund all nodes except the Colossal node which grants the warrior to carry a chest that has 20 slots. I have made sure my bags and the chest is empty when trying to refund and still I am unable to do so. I am not trying to change Ascendency but simply just to repec to other notes under the Titan Ascendency.