Guild Wars 2

Hi, before yesterday I created a new build for my Elemental (http://gw2skills.net/editor/?fFEQJArdhMMqb23wsBf0AEACpphDk4w4W9CC-TxhAABws/AaK/OS9HIVC2xJAAH9AA8AAIDg/cA-e) and I was with 19,300k – 19,800k HP more less I don’t remember exactly so today I logged and my Elemental was with 18,335 I don’t know why Is it a bug or nerf ?

Did you factor in any wvw bonuses that may have been removed since last night (wvw reset) or map-based effects?