Something wrong with damage

When my Windows10 connected IOS8.4 Minecraft 0.12.1 .I enchanted the my diamond armor and diamond sword first, then I let Win10 harm IOS with play no armor, the damage is 2.5, but playing Win10 IOS and hurt only 0.5, And the diamond armor broke quickly when they are armored.Also you can hold the mouse to attack the player and you can damage the player more.