Here, check the dedicated page for hours and days calculation.

https://www.crypto-coinz.net/coin-info/?43-BULWARK-BWK-NIST5-calculator/

your hash speed gives 38.796882 BWK reward for 24 hours, which is on the current rate on cryptopia $ 176.37 a day.
The data on which the calc is done is real time, there are spikes and drops in the hashrate and prices on the exchanges. If you were sending to the exchange and selling the BWK instantly for the last 24 hours - that was going to be your profit. You kept it the price went down, hashrate back up and you mined less that were worth less. All the data used in the calculations is on the site shown, so you know what is used for the calculations.