Spawn point not being in centre of room

I have been following BlackThornProds tutorial on random dungeon generation and at about 4:00 in the video he says to make an empty object, put it as the room parent and put it in the centre, he does this by making the position 0,0,0 however when I do exactly that the empty object goes to the top right. If anyone knows how to fix the problem it would be greatly appreciated if you could tell how to fix it.

also Im using unity 2019.2

The spawn point is the child of the entry room, make sure the room is also at (0, 0, 0), or drag the spawnpoint in the hierarchy so it is not attached to the entry room. Children will inheret the position of their parents