Sometimes when I'm in the project window creating a project, a light red square outline appears in the Water Level Offset box when I type in the number for the offset. This is always a negative number for me, but the red square is there on any number entered. What does the red square around the number mean? How to I avoid getting it? Its as if the program doesn't want to accept the offset for some reason. Eventually, through random clicking or coming back to it later in the project, I am able to put in a number without the red square appearing, but sometimes the offset does not show up on the shaded relief map image, even after regenerating the map. Maybe there's a specific time in the project I need to enter the offset number?