I don't understand something on ultrasound.money website...can you help me?

So, last Saturday I noted on ultrasound.money website that eth supply went negative of -1%.

Today, independently by the time frame I set, the supply is negative of only -0,7%.

The first explication that came to my mind was that eth went inflationary again for some time due to lower activity on the network.

But, the base fee window reports that eth has always been deflationary for the last 30 days. So, how's possible that the supply went up on the last few days (from -1% to -0,7%) with a persistent deflationary status of eth during the last 30 days?