If you follow these steps Spark will show someone is offline when they are actually online. I don’'t think it matters but we are using wildfire as the server.
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Login with spark.
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Login with jwchat.
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Disconnect with jwchat (still connected with spark).
In other users contact lists you will now show as offline. It can take a while before they are shown as online again. I haven’‘t tested it much but if they message you they will not appear as online for a few minutes. If they don’'t message you then I think they will be offline for longer. On the jabber server, the user always remains shown online (which is correct).