The growth habit suggests it is a tissue culture plant. They can have problems fruiting as depicted below, most likely due to excessive suckering. Container plants can develop a sprawling/suckering habit if left unpruned and unstaked.
To make a more productive tree you can try rooting cuttings, because they will not sucker as much and be easier to maintain. To make your tree more productive you should ideally remove all but one growth. Stake it up and do not allow any branches or suckers to grow, so all of the energy from the roots goes to growing that one growth taller, and thicker. Then prune at 18" once the trunk is close to an inch thick and select branches for a strong tree.
This picture from Agristarts shows a TC tree that suckered so profusely if it had set a crop it would be flat on the ground from the weight, all of the growth is new and soft. All crowded for space and weak, as if the tree is competing with itself to grow more.
![[DETA2-91]](http://www.agristarts.com/_ccLib/image/plants/DETA2-91.jpg)