I was walking around at the beach having a good time when I suddenly got blown up by invisible mines.
I reloaded the game, but could still not see any traps around me. When moving the camera to the area when my charaters are far away, I can see every mine and a dirtmound. As the characters come closer they all dissappear. Exactly the opposite of normal when things comes into view. My characters have 7 and 8 in perception, but I feel like this is a bug.
Link to images showing where they are/are not(Upper left corner):
Here my characters are far away and the mine is visible.
Here I came too close.
This also goes for the gravemound next to the mines.
Some more screenies:
Far away Close by 
