Did you ohm out the cables after you built them? Test continuity of the center conductor and the shield then test for a short between the shield and the center conductor.

Sometimes it easy for one little strand of the wire to bend back on insertion to the connector and short out to the shield. If you don't have a short but one of the conductors is open then you didn't strip back the insulator far enough or didn't slip the connector on the wire far enough.

There's a how to video on the Liberty site and they also have a tech support phone number. You might give them a call and see if they can provide any insight. According to their specs the connectors are supposed to work with Beldin 1505f.