The estimated value of your wallet (displayed in USD) is a real-time conversion based on current cryptocurrency market prices. Because these values fluctuate constantly, your total portfolio estimate may increase or decrease at any time.
Your actual balances — the amount of each coin you hold — remain the same unless you perform a transaction. Only their market value in dollars changes with the market.
To verify your true holdings, always check the Wallet section instead of relying on the USD estimate.