The value refers to a direct sale in real time with variations in value + sales fee, the correct thing to do is for you to place the sales order.

Simulating a trade of $BTC for USDT, can someone tell me the huge difference that always results in the values?
Is this a camouflaged fee? If not, what is it? It happens all the time.
In the images, the value of $BTC "drops" from $97,841.58 to $97,378.30 when I do the conversion.
Note that the time is the same. And there is no real change.