Why did my KDP royalties go down?

[Julia]

I self-published with KDP. I checked my sales a week ago, and my royalties were $78.32 (still not enough to deposit in my bank). Today, my royalties show $60.38
I have not made any more sales, and I don't think my book was returned. What's this about?

[Julia]

I think I figured it out... It was only showing me the last 30 days.

[Nik]

Exactly 😎 , well figured!
“Historical” rubric shows accumulated royalties for the entire period

[Julia]

Thanks!