This chart is showing data coming from satellites, is delayed, and doesn’t get updated often.
It’s always been this way (although it’s been slightly improved lately).
See:
Don’t mind weird results for the past 3 or 4 days. And because it gets reset every month, the first 3 or 4 days show literally wrong data, every month. That’s usual.
Here is how it looks on my node today, for reference. You should see a similar shape:
@Cappy Your node is fine - with regards to that graph at least.