Why does my whole wheat bread turn out with a crumbly, spiderweb like top in my bread maker?

I have an upright bread maker that also came with a recipe book. Following the whole wheat recipe, it always comes out with a crunchy spiderweb like top. I'm wondering of the recipe is just messed up? And if so how should I go a out fixing that? Recipe is: 1.33 cup Water 2 tbsp Olive Oil 2 tbsp Honey 2 tbsp Milk Powder 1.25 tsp Salt 4.33 cup Whole Wheat Flour 1.5 tsp Yeast submitted by /u/LOCDAR