Fixing a trend line that pointed the wrong way
The wall shows your collection's value with a small chart beside it. One day the value said it was down for the week, while the chart clearly pointed up. Both couldn't be right.
What was wrong
The chart followed your collection's total value. That total goes up when you add cards, not just when prices rise. Add a few cards and the chart climbs, even on a week when every price fell.
The fix
The chart now follows price movement only. Each day it compares the same cards to their own prices the day before, and links those changes together. Adding or removing cards no longer moves the line. It also covers the same seven days as the change number next to it, so the two always agree.
The fix also sorted out the 7-day movers page, which now shows three cards up and three down, instead of the single card it showed before.