Valdo Map + Clear all Rituals ( 1 Ritual (first i met ) not Runable Map 0 Monster Left

Very confusing, first i thought i didn´t kill all required monster in the circle. but after clearing the map and run all other 3 rituals the first one still not able to run. don´t know where the problem could be, its in standard settlers league not in the event. Good for me its "only" a eternal struggle reward nothing really to freak out about ( luckily ;) )