Is it normal for the payment to arrive less than what the browser shows?

Yes, this part is what used to be very normal for Brave. They have fixed the larger issue it seems and we’re back to this.

“Why is my payment amount different than what my ‘estimated earnings’ was showing”?
This is perfectly normal! Sometimes ads do not fully reconcile (“cash in”) before the end of the payment period. So while this does appear in your Estimated earnings in real time, unreconciled funds will not appear in the current month’s payout and will instead be “rolled over” into next month’s payment.

Well, I’m assuming that yours is that situation. Not sure if you paid enough attention to see what your Estimated Earnings are and whether it appeared there.