When you enchant a diamond pickaxe and you put in an Anvil with another enchanted diamond pickaxe you can break block of dirt with grass on it, and it drops a block of dirt with grass instead a dirt block.
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This isnt a bug _ you just have silk touch I on the pick which is why when you break the grass you get grass blocks this is the same for stone if you break stone in a cave it usually drops cobblestone but with a silktouch pickaxe it drops stone instead of cobblestone.
This is because the grass block is a separate item from the dirt block (both are obtainable in creative inventory).
You should read about Silk Touch Enchantment on minecraftwiki.net, this will solve your problem...
u_u
rtfm