It calls for 10.25lbs Belgian Pilsner and 1lb of Belgian Wheat to be mashed at 150 for 90mins.

Yield = 5 gallons

OG: 1.078 - 1.079

Well, right off the bat I'm going to say that the recipe is missing something: sugar. You have to achieve over 90% efficiency to get to the target gravity.

Look at the description of the beer to see of they mention sugar additions (other than the fruit juice). Otherwise, you'll need another 4 to 5lbs of grain to achieve your gravity.

Here's why:

When 1 lb of grain is mashed to make 1 gallon of wort, homebrewers can usually count on the gravity being 1.026. For simplicity, we call that points per pound per gallon (ppg) and drop the 1. So, most homebrew systems get 26 ppg.

The recipe has 11.25lbs of grain. That's 26*11.25 for 292.5 potential gravity points. Divide that by 5 gallons and you get 58.5. That's a starting gravity of 1.059 when rounded and exactly what BeerSmith calculated. This means the recipe is missing about 4 lbs of grain.