they appear where they weren't, in a moment there is nothing and in the next they are there, but when this happen they don't come running they just appear out of nowhere even if we are near or not of the walls
I couldn't replicate ghouls teleporting around. They always spawned on one spot and then started slowly walking towards you. I was switching areas, killing them and leaving areas, passing a week and coming back and they always spawned at the same spot.
Is it a specific location that does that, or some specific action?
My theory is that because of the darkness and the fact that ghouls home on you from the start (They don't have a cone of vission like other enemies. They always know where you are and are always chasing you) makes them look like they are teleporting, which isn't the case when you get rid of the darkness.