In the system information, you can see the RX LEV of the neighbours, and this value is re-used in the neighbour window.
It’s either there’s a lag between the lay3 and the display of TEMS or
… are you sure you’re matching the rxlev with the right neighbour? They are identified by their index, not their BCCH, so it might be a little complex to trace it back to the correct neighbour (a *little* complex)
Rex, there is no ‘SUB’ for neighbours : DTX can’t be activated on the BCCH TRX (it’s 3GPP-forbidden, for very good reasons). So the MS always measure the ‘FULL’ from its neighbours.