I have played many games as different cultures and one of the things I have noticed (and posted on before) is that, in the Factions tab of the Leaders screen, not all of the faction descriptions contain text explaining which leader traits provide benefits and/or costs.  Some of the factions do specify which traits provide benefits/costs (see screen snapshots 2 - 4 below), but some do not (see first screen snapshot below.)

Please assign someone to review the text for all factions to ensure that the text includes descriptions of which leader traits provide the benefits/costs.