That sounds normal: everyone gets a portion of what customers upload… and customers upload at different rates at different times. Some months are just slow. And we’re expecting more garbage the next couple months as files from old accounts get cleaned up.
But even though you may not use a huge amount more space this month… your node is still working its way through being audited, and also getting through the initial 9-month withholding period. So if you stick with it you will use more space, and will start earning 100% payouts, and will start making more money! Good luck!