In a cell that is part of the vanilla game, whenever I'm trying to use the render window, or place something through the render window, the Landscape is flagged as edited. Why does this happen? Is this normal, or harmless?

I've also noticed that certain landscapes' editor IDs change depending on the load order. That is, the first two values say "02" or something instead of "00". Placing an "ignore" flag on them causes the landscapes to disappear the next time the esp is loaded.

The first two bytes of the form id correspond to the hex value of your mod in the load order.

Dragging an object 'through' a cell is the same as 'changing' it, because it contained at one time, a new object, the one you dragged through it. It then remains changed.

If you ignore your new landscapes, then it will remove all changes from the cell that you ignored.