ShareThis service does not provide useful link for article but directs me to their site instead

I wanted to share the following article via my twitter: http://community.jboss.org/wiki/InfinispanDistributedExecutionFramework
So I used ShareThis and clicked Twitter icon. It generated the following Tweet content for this:

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Infinispan Distributed Execution Framework - JBoss Community http://t.co/Uhxwsif
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The problem is that the link http://t.co/Uhxwsif does not take me to the desired page but to ShareThis site instead. Is this expected? Do I have to be registered with ShareThis first?