The weapon will probably be there after (hard-?)resetting the game.
The Orb of Power doesn’t include Talents, and you’re not the first person to make this mistake/assumption (so don’t feel bad). See @sirrian bug for orb of power.
Perhaps consider submitting a ticket/request on their support site if you would like a better resolution 
. (https://gemsofwar.zendesk.com/hc/en-us/requests/new?ticket_form_id=360000013595)