The trading bot solely considers the profit generated from a transaction and does not factor in any gain or loss resulting from the fluctuation in the value of your coins. For instance, if you hold Bitcoin in your account and the bot earns you a profit of 10 USDT, but the price of BTC falls against the USDT, causing you to lose 11 USD, your net loss would be 1 USD.
Alternatively, a rise in the price of Bitcoin could also be a contributing factor.