What is P/L?
P/L is your Profit or Loss in Pips.
Gross P/L is your Profit or Loss in your base currency.
Net P/L is your Gross P/L with commissions and interest.
Day P/L is your Profit or Loss in your base currency for today's trading session, starting from 5PM EST until 5PM EST the next day. Therefore, your overall trade may be positive, but your platform may display a negative number in this column if the position has moved against you since 5PM EST.