The chart looked fine in the code. The data pipeline was correct. The chart library call had the right shape. Every prop was passed, every array was populated, and nothing about the component would have looked suspicious in thirty seconds of review. If you had put that diff in front of me cold, I would have approved it. Then I opened the page. The performance chart was rendering the same series twice: two overlapping traces at slightly different weights, a smeared, doubled line that no one...