It's a bit difficult with all the IOTA decimals. That's why we have added 3 different tickers:

IOTA -> IOTA Token Coin (1 unit)

One single IOTA unit

IOT -> Mega IOTA Token Coin

One million IOTA token and also the unit Bitfinex is using.

GIOTA -> Giga IOTA Token

One billion IOTA token

All Bitfinex importers are now importing as "IOT -> Mega IOTA Token Coin".

If you manually import IOTA purchases, please use the current common denomination of IOT.