Itself falls(on) the game menu in the game!!?!? (Alien: Isolation)

Has already passed half the game,and suddenly noticed a very strange bug!!!!In the hospital during the game itself joined 2 times the game menu,I could not well include,it turns on the ESC button,but this button from my fingers was very far away,nobody knows what's going on??????The mouse is not pressed...do not understand what it was....