Relation Event Categories list to Upcoming events - Timeline Layout

What settings are responsible to show/link to the Timelinelyout of a category form the category list.

Example:
if i click on International ( 2 Termine) in the category module on home it links to the thimelineliayout international
www.agenda.kulturthalwil.ch to www.agenda.kulturthalwil.ch/index.php/international

but if i click on Lokales&Kultur ( 2 Termine) it links to a category view on home instead on timeline Kultur/Kultur& lokales

www.agenda.kulturthalwil.ch not to www.agenda.kulturthalwil.ch/index.php/kultur/kultur-lokales

thx for a hint
regards marc