You should see all meal bases for the supplier that is returned. It's only if that supplier doesn't cover all meal bases that you may (currently) miss something.

For example, if a search returns the same 10 rooms from Supplier A and Supplier B. Then we will only return cheapest out of the 10 which will in most cases only include the cheaper meal bases e.g. Room Only, Bed & Breakfast and likely not include the more expensive Full Board and All Inclusive rates in the results as these is a more expensive board basis than a B&B rate.