Chart not showing names of table/ plotted lines anymore in the top header

I changed the name of the heading in the table that plots the series called Opt @Expiry and Opt @Now and name changed them to Price @Now and Price @Now in the tables the data is drawn from.

Why is the header with the chart colour scheme above the chart title still showing the old name? Note there is only 1 search found of each the old "Opt" names (now called Price) and that search result leads to the header and 1 search found of: L1-7: P/L @Now and L1-7: P/L @Expiry -- both again only found in the chart header.

Why aren't the new lines plotted on the chart now being shown in that top header colour panel? i.s L1-4 Price @Now and ditto for L1-7 Price @Now.

Cheers!