In Minecraft PE server edition, why does a stone pickaxe disappear after breaking one block?

While playing on a server running
22:42:45 [INFO] This server is running PocketMine-MP version 1.4.1-980 (Implementing API version 1.11.00 for Minecraft: PE v0.10.5 alpha protocol version 20)
Whenever I use my stone pickaxe or any pickaxe for that matter, it disappears after I mine a block (dirt,stone,wood) and all my other pickaxes disappear from my inventory and then randomly show up.
Anyone seen this or know what might be going on? I am playing on a Samsung Galaxy Note 10.1 2014 edition.
Let me know if there is more info that I can give to help with this.
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Minecraft, But It's Only One Block!
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