It can be because of the payout type. And i'm not exactly sure of Bongacams, but if it works similarly to Chaturbate, where you can be a performer and an affiliate with the same account, it could be an explanation too. I remember, when i switched the payout to wire on Chaturbate as an affiliate, they asked for either a passport or two other identification documents (national id card, drivers licence, social security card etc). On top of that they wanted a me to fill out a performer agreement too, but when i told them, that i have no intention to perform on the site and i'm an affiliate only, the agreement was not required anymore.
Ask them, if you want a definite answer. That's what i did too with Chaturbate.