The amount in the top-right corner of the screen is the real-time total value of your account.
(1) The real-time value of your POSITIONS (see: What is the current value of my position?);
(2) Your CASH* - which includes your Ring Fenced amount and your Available Cash (see: What is my total Cash?)
*If you don't have any open positions, the real-time total value of your account and your Cash will be the same amount.
If you have open positions, however, your CASH will be what remains of your capital after you have opened those positions. We lock a small part of your Cash to make sure your fees are covered, the rest is available for trading of withdrawal (see: What is the Ring Fenced amount?)
Questions? Yell out at BUX Support!