Dead zones on maps?...are they possible?

So what i’ve sorted out so far is its a height thing…the lowest part of my map is a dead zone and anything on that level or lower just wont spawn anything
How I know this so far is I put the spawns on the highest bumps of sand on my lower beach and the dinos spawned on all of them, even on angled slopes. but anything below that height and they just will not spawn.

It may be something else as well, i’m not sure. my Kill Z level is - 75000 surely that’s enough no? apparently not. or I am missing something else.

on top of that I have this crazy new issue…


In the editor the floating island looks all nice and purty


Running the game, it pops in. leaving it looking like this most of the time.

how do I just have the structure there in the sky