Here is the best explanation I can give. Blocks IDs have a primary and secondary digit. This occurs when there is a variant of a primary block. For instance Dirt ID is 3 but Coarse Dirt is 3:1 Podzol is 3:2. The same applies to leaves and mushrooms. In the previous Update mushrooms and leaves had numerous side variants, however when the update occurred these type of blocks had all their miscellaneous ID consolidated into one. So now mushroom blocks are just 99 and 100, vs the 9 or so other variant of the blocks, including stem ids. And same with leaves now there is only 1 leaf id for leaf type. So the reason we have untextured block is because these numbers may have been missed or never consolidated so the texture is missing as the texture is now only being assigned to the main block ID. I discourage the buying of these blocks until the 1.9 update occurs on this server. My suspicion is these blocks will disappear when the update hits.
