Clustering on one model's performance doesn't work as expected

[Firenze11]

Steps to Reproduce

• remove "@score:model_1" from "Cluster by" selection box
• reduce "Number of clusters" from 4 to 3
  

Expected Behavior

Expect to see the clear-cut separation of green curves wrt their positions along X axis in the "Performance Comparison" chart

Current Behavior

Green curves are overlapping with each other wrt their positions along X axis in the "Performance Comparison" chart

Context and Environment

• Module & version: [e.g. @mlvis/manifold, v1.1.1]

Possible Solution