ontriggerexit/stay/enter not triggering on transform.position

i have a random map generator to build a city, and i have a game object that moves around the terrain to build the city.

it does this by

1. a random number generator to see if it will spawn a building

2. will either spawn north south east or west

3. check to see if there is already a building placed in one of those locations

4. spawn a building if there is no building there

5. move to the next area and start at number 1

but for some reason i keep having buildings spawn on top of each other because for some reason ontriggerontriggerexit/stay/enter isnt triggering properly, on the spawner i have it check the ontrigger event and if the tag is correct it will return true, otherwise it will return false.

the building game objects have the properties

1. transform

2. navmech obstacle

3. box collider

the spawner has

1. transform

2. the scrips to move it around and spawn buildings

3. box collider with is trigger checked

4. rigidbody with is kenematic checked

is the issue that these methods are being run in the start command?