had the same issue
all stats in this expression are available by default.
in stats editor i've found similar stats with different names
e.g. "flop raise or bet" and "Flop Raise or Bet" and etc
i've checked their implementation and i swear it is god damn the same...
and somehow following expression works just fine
"(Cases(Flop Raise or Bet) + Cases(Turn Raise or Bet) + Cases(River Raise or Bet))/(Cases(Call Flop) + Cases(Call Turn) + Cases(Call River))"
im confused as hell cause my custom stats are not working and this story with undefined behaviour related to aggr factor stat is quite confusing and depressing