Dear, both screenshot are taken at just 1 minute difference. But I still agree with you that during this time, BNB price changes and this there can be difference in USD price.
BUT in BNB it should be same in both Screenshots. IF you check both Screenshots then FEES IN BNB are different in both screenshots. in one it shows 0.000797 and in one it shows as 0.001015
The transaction ID's of both transactions would be of much help than screenshots if you don't mind posting them. I think the different might be due to the different gas prices you used for the two transactions. It's a guess, but the transaction ID details can help debunk this.