Issue: load function tag runs when the player loads the world even though it was not the first time the world was loaded to a player

I was playing on my world as LAN and my friend does not have the resources from the resources.zip in the folder that change the textures, so my friend can not see what the stuff is supposed to be. So he loaded the world again and again, and he still does not  have the resources. But then he noticed something, the dragon that was supposed to spawn when the world was first loaded, was spawned multiple times. I thought that the load function tag only ran when the world was loaded for the first time. This should be fixed and also the point where my friend did not get the resources. Here is the data pack that had spawned the multiple dragons on the attachment. I also had Minecraft running very hot when it was running LAN, so it had over heated 2 times in the LAN world.