"Shading factor diagram" doesn't match the "shadings animation"

[atgosat]

Hello everybody,

Recently I've encountered a problem regarding the shading diagram and I haven't been able to come up with a logical explanation. When I perform the shadings animation of my plant for the 21st of December, I obtain the following shadings curve:

 

 

As per design criteria, there are no shadings between 10 and 14 h. However, when I compute the shading factor tables and display the graph, I obtain the following:

 

 

If I observe the 1% shading loss curve, it turns out that it cuts the sun path curve for the 22nd of December during midday. This shocks me a little bit as when I perform the shadings animations there are no shadings at all, but according the shading factor diagram, shadows appear at midday out of nowhere, and I am not able to understand this behaviour.

Has anyone else experienced this kind of behaviour, or does anybody know what can it be due to?

Thanks in advance for the help,

Atanas