Heatmaps scrolls are too few

I need some help with the plugin “Heatmaps and session recordning” that we use in our on-prem installation.
There are many clicks and moves in my heatmap, but only a very small amount of scrolls, for example 0,1 %, and it does not make sense. How are scrolls calculated?

I have looked all over the documentation but I can not find any information about how scrolls are calculated and visualised. Please could you help me understand why scrolls are so significantly small?
Grateful for any help!
Best regards,

Moved to Premium feature category, then @innocraft will be able to reply…

Hi @E111 it may be best to get in touch with us directly on shop@matomo.org. As we may need to see your current configuration and a link to the URL being tracked for further insights.