Falling through the map

Hi guys

I’m on a new map, and when I try to play on editor on certains zones, the npc fall the floor. I enabled the world composition when I started making the map. Collision is set to “Ground”.

Any Ideas what should I do or what could have went wrong?

this part may give an idea: “when I try to play on editor on certains zones, the npc fall the floor.”
what is your landscapes X Y ? Not the 200x200x200 (or whatever, but the LOCATION coords)
I ask because the max distance able to be used by ark is +1.2 million and -1.2 million. On the safe side, i would make sure all landscapes fall between (as in under) XY of +1 mil and -1 mil.
This is caused from replication restrictions.

On -166420 X -184510 I start to falling

And the locations coords from map are -342900 X -342900 Y and 100 Z