Reading 26 performance evalutaion- misfit and investor active return

CFA Level III
#1

true active return = manager (sub-portfolio)return - normal (benchmark ) return
misfit active return -= normal (benchmark) return - IPS (overall portfolio) return
investor active return = true active - misfit active return

is the 3rd formula correct? its confusing based on the curriculum

#2

investor active (mismeasured) return = true active + misfit active return
NB: the misfit active return could be a negative number
i.e normal portflio return < investor benchmark