Are you using TEMS ?
Check the HO COMMAND message (layer 3) received by the MS. In this message you can seee to which frequency (TCH) the MS is going to handover to.
BTW, in tems, the serving cell often appears as neighbour, but that’s not a bug. It shows the BCCH RXLEV. While the serving cell “active” measurements (in the main window – not in the neighbour window) show the TCH RXLEV.