There's seems to be a lot of confusion between Standing Stone puzzles and Cairn Stone puzzles. Cairn Stones are when you stack the stones as high as you can, Standing Stones requires you to line stones from a certain angle to make a pattern.
Notice the different symbols for them on the map.
This will likely be the first you come upon, now you just need to activate eagle vision with
and line up the glowing pattern.
This is what it will look like when you have it lined up correctly.