Most of my Brave rewards haven't been sent to my wallet for 2 months

Hello, very little amount of my brave rewards have been sent to my wallet for 2 months. For example, even though I had around 5 brave rewards in that may, a figure like 0.25 was deposited in my wallet. In June, even though there was 8 BAT, a very small amount was sent. What is the reason of this?