I started paper trading with the default $100,000 in the account. After making a few trades, my cash balance went up to $100,046. However, the buying power is still $400,000. Why isn’t it updated to $400,184 (4 * cash balance) ?
Also, while I held one long and one short position, the cash balance suddenly changed from $100,000 to $100,543. After liquidating a short position, it changed to around $85,000. Is there an explanation for this happening?