It is possible that the amount was correct several hours ago, but due to market fluctuations, the amount may no longer be accurate. It is important to always double check the amount you are trading with to ensure it is up to date and accurate. Additionally, it is important to use a trading app or platform to ensure you are getting the most up to date information and trading apy. This will help ensure that you are trading with the right amount and not missing out on any potential gains.