In my current meal plan, on my workout days I minimalize fat intake and maximize carbs/protein in a 40/60 split - the calculator suggests Greek yogurt or fish chowder for nearly every meal. Obviously, this is more on the extreme end of diet planning and arguably I wouldn't have much of a use for it since I already have my own specialized plan.
I think it might just need more recipes. He added recipes fairly recently, and he's still building those up, so it might have limited options right now for cases with very specific constraints. Also, Greek yogurt is kind of a wonder food when you need high protein and low fat :-)
Interesting. What nutritional requirements did you enter to give that result?