Totally Broken Correlation Grid

Why is 7 vs 1 the same as 6 vs 2 the same as 3 vs 5 etc?   6 cells are identically computed. Only 2 cells (7 vs 1 and 1 vs 7) should be computed the same way.

Hovering over 7 vs 1 underlines  6 cells in the grid! Hovering over 7 vs 1 should underline only 7 vs 1 and 1 vs 7....

This has been broken for a few versions apparently. Surely I'm doing something wrong or this bug is only effecting me, how could such an important function be so broken for so long?