From DCT https://dashtalk.org/threads/v12-release.5888/page-42#post-65571

I found a little bug in InstantX. After successful payment and 1 confirmation "listreceivedbyaddress" shows 6 confirmations (5 IX + 1 BASIC), but "listsinceblock" show only 1 confirmation.