Hey @DiegoCalabrese ! Welcome to the community 
What you are observing is the estimated earnings showing more accurately what you have earned in the month.
The estimated earnings counter has been reworked and users have noticed that the value shown is lower than what it was previously; your BAT has not gone missing, what is shown is the correct amount that you will earn in the next payout in August
For more information, please refer to this post → Update: New and improved “Estimated pending rewards” (Brave Ads earnings) counter coming in v1.27
Porridge