Lost nearly 1/3 of earnings last month, same subscriber amount?

Last month has been my worst performing month out of nowhere and I've lost several hundred dollars for no apparent reason. I don't understand how this can happen when my subscriber amount has not significantly changed.

I know about the recent payment issues, but most of my subscribers have resolved it, yet my earnings for last month are still at a drastically low number. Does anyone have any similar experiences or know how this could have happened?