Upgrading Barricades

I have a level 16 barricade with health with health 28,032 (after the 4.3% unit bonus). When I go to upgrade it to level 17, it says it will increase its hitpoints from 18,535 by 3,084 points. One of them must be wrong! I’ve attached a screen shot of the barricade upgrade (from level 16 to 17). 


The upgrade screen doesn’t take any blessing in consideration. Enyo barricade blessings gives extra hp to the barricades, explaining the difference.