I have been using seaweed for decades and not once had any strange occurrences. Auxins are distributed throughout the entire plant, generally in higher concentration where the newest growth is taking place, but there is no one telling the auxins where to go, unless you have a plant with a brain! I think if you look closely, you will see that something has eaten the tops/growing center section of these two plants, resulting in the branches of the next highest node to become the main growing stems....basically topping your plants for you. This will not cause any problems unless you are wanting to keep an even height of your plants growing canopy. Either some training or topping will achieve this, however those branches would also make first class cuttings. Hope this helps.... Organoman.