saying no shelter... with in shelter

[sterile gorge]

10x10 is the maximum safe area. Any more than that risks breaking shelter calculations. You'll need to add internal walls

[coral shoal]

ok yea this is WAY bigger then a 10x10

[sterile gorge]

Basically 10 squares in any direction at most is what's safe

[coral shoal]

yea this is a 9x19 xD

[dim hinge]

Actually it's more than 9 open squares in any direction will result in Sheltering issues. Add internal walls to make each room smaller.