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.