What is this ghost grey line? Do i ignore it and what is the better method picture 1 or picture 2 — or are they the same thing since the plot points are the same?

This is on my old laptop (RTX 3050 TI), but my Gigabyte RTX 5060 TI 16gb on my pc, the ghost grey line has the same behavior.

MSI afterburner v4.6.6 final