Issues with 5 and 15 years charts

[salix1974]

Hello Everybody, my name is Maurizio and i have a little question about the 5 and 15 years charts.
Often i try to buy spreads before season start, nearby the highest/lowest part of graph and often this strategy in profitable but during this 2 weeks i’ve seen an all new fact.
5 and 15 years line seems to adapt to the actually price trend.. How this is possible if the statistic can’t change?
I try to explain my problem with this pics.

[Mira]

Please read this article https://www.seasonalgo.com/seasonal-patterns
There is all described. You can't use seasonal pattern in absolute values, never use seasonal patterns for TP, SL levels determination.

The normalized seasonal patterns give you a highlight about direction.