Nice database but categories make no sense

There are a lot of foods in the database, which is the good thing. However, the broad categories are nonsensical. Amaranth is a high gi food, while amaranth and wheat are low gi? Also, tacos with lettuce, meat and cheese are low gi, but tacos or tostadas with lettuce, meat and cheese are high. This app needs work.

zandarthemagnificent about A Low GI Diet - Glycemic Index Search, v2.0.4