Hello!
This is because there's not yet a detection of the category set in the menu item.
But i'm working on it!
Today, calendar link are using the first itemID of the menu to iCagenda Events List.
Which, of course, is not the best solution when a site is using many menu-item with different category set individually.
I hope to integrate the detection of category in next major release 3.4.0 (which one will have a lot of new options and coding! Still a lot of work, but will be great!
)
Keep in touch, and thanks for your patience!
Cyril