That is highly unusual. I suggest blending longer and perhaps try adding more liquid. Make sure you have liquid to the fill line.

The almond milk is in the recipe for flavor and added protein. It can be switched out with regular milk just fine. If doing that for breakfast or post exercise, I recommend adding a bit of greek yogurt or a handful of raw almonds (or both) to increase the protein a bit.

It is not recommended to replace all meals with just fruit smoothies, such as just this one recipe. This is for a couple of reasons. First, the calorie intake would likely be so low for the day that you would either be hungry and sluggish all day or you would lose weight too quickly, which tends to lead to rebound weight gain. Second, your diet could end up lacking in protein and other nutrients. You could perhaps do mix of smoothies, some of which incorporate higher protein and vegetables, and make sure that you are getting enough calories. Or, I suggest replacing one or two meals with smoothies and then eating a healthy light dinner that incorporates a balance of protein, vegetables, and carbohydrates/fiber.

The recipes are generally based on one large cup. This particular one says one serving at the top and one large cup for the size. If you see any that says two, it is because some people split the recipes into 2 small cups. But I ask people when they submit recipes to aim to calculate things based on the large Nutribullet cup size.