I have started the separate thread about his problem in Spark forum some time ago. Today i have found another issue which could be related and have posted it there. In case this could be interesting for you, Daniel:
Today this mistical offline contact was Online in Miranda, so i decided to check this and launched Spark. So this contact is now showing as it should - Online, and there are no other false contacts without presence in Online group. I presume this will change when this contact goes offline.
pri podpiske ot jabber klient ne vsegda prohodit zapros videt ego(icq klienta)status,a status jabber klienta na icq klient vsegda prochodit,mne pomogaet restart servera.