Return of Reckoning

Hi im a new player and i play a Healer ! but in all PQ i do im alwhys last when im healing if i respec to dps i geting higher up in contribut list . is it something i do wrong as healer or do healer geting lower contribution then DPS is it so that 1 dmg give 2 contibut and 1 healing give 1 ocntribut it feels like or what im i doing wrong ? any one haveing same problem as me ?

Best Regard Icedust