Markers appear only when chart is squeezed

[Tessanix]

Hello, i'm doing some computations on a study in order to display buy and sell signals on the chart.
The problem is the signals reprsented by the markers does not appear right away when I open the study.

I have to squeeze the chart ( to look back for older bars maybe ??)

then the markers appears.


Can someone explain why it is happening and how I can fix it please ?

 

[Tessanix]

Does anyone have any ideas to help me? :/