Respawn - Not rotating prefab

Hello,
I have an issue. I want to respawn prefab and moving around in nav mesh. Nav mesh is working when it respawn prefab but prefab rotation is wrong and it seems like it is moving in head/butt. I tried everything to fix it but nothing worked, so if someone help me i would be very happy

Most important piece of code:
void Start()

{
InvokeRepeating("reSpawn", 20f, repeatTime);
}

private void reSpawn(){
//Instantiate(spider, spawn.position, Quaternion.Euler(90, 0, 0));

Instantiate(spider, spawn.position, spawn.rotation * Quaternion.Euler(90, 0, 0));
}

In game it seems like and spawn point or prefab initial settings are:
https://ibb.co/NYmzTLL

When i start game prefab armatures rotation on X = -89.xx and even i change function to 0 its always set as on picture. I also tried: gameobject obj = Instatiate(spider, spawn.pos, spawn.rot).as gameobject
obj.transform.rotate(90,0,0) but it has no effect.

For every tips thanks.

 

Finnaly fixed. Solution: Armature od that prefab was in -90 degrees so i changed that and now it working properly