why wasn't I given +4 hp and +4 stamina?

[iAyham]

why wasn't I given +4 hp and +4 stamina? (quest 18 lvl cow spawner). the description shows this award. I did, the milk and the experience gave. The rest wasn't given.

 

[LucaMasol]

The +4 hp and +4 stamina are flavour text referring to how mobs get stronger the higher the level of the spawner is