It is always like that, if you use lucky as primary pet do not slot other pet egg on its happiness stat the 5% luck from its passive attack will not occur and the big circle aura around lucky will not show up, and as for hisha aa you only get 10% luck if you use it as slot egg on another pet, hisha aa can give 15% luck only if you use it with any of the spirit dragon pets happiness bonus stats, it means if you have hisha as primary pet just use it and do not slot other pet egg on its happiness slot, thats why hisha aa is not the best for the % of luck, instead you can use oswald aa it gives 15% luck and 15% gold loot (the % is not mentioned in the aa description but a dev once confirmed it is 15% on forum) no matter where you slot it onto, for the %luck from happiness you can use timur or geng 25% luck.