Wrong Number of Contacts
One of my accounts is atm used to join MUCs only. These MUCs have autojoin and autominimize active. After connecting, gajim counts (1/1) contacts in roster (for this account) - but there are 3 GCs. "Show offline" -> "Hide offline" will refresh that - now there are (3/3).
When maximizing the GCs, it wont recount the contacts. 0 GCs minimized, (3/3) Contacts.