In stage 2 of attachEvent("onEditCell" why does background color change?

Depending on the value of cell A, I have a specific background-color for that cell. When I edit a different cell, say cell B, in the same row using attachEvent onEditCell, why does the background color of cell A change in stage 2 of making a change in the value in cell B? onRowSelect is not called. I don’t want it to change and can’t figure out what is causing the change.

Unfortunately the problem cannot be reproduced locally.
Could you please, provide a complete demo or share a demo link, where the problem can be reconstructed.