"Recent average position change per day" shows 404. That didn't look right so I computed the average of "Last 30 Days" position changes, which turned out to be only 274.8. The last 30 days also has not shown a change greater than 400 since July 22.

You might want to define or redefine "Recent." Your calculation might actually be correct if you are computing the last 60 or 90 days. But, I think most reasonable users would assume not more than the last 30 days as shown. The last 10 days might be even better.

Recent average credit is calculated over a maximum of 60 days (depending on history length).