Perhaps both of them have been taught to follow the regulators recommendations. CAAP 166 advises descending on the non active side after overflying. It specifically warns against descending on the active side. See Below.
6.6 Arrival procedures
6.6.1 Where a pilot is unfamiliar with the aerodrome layout, or when its serviceability, wind direction, wind speed, or circuit direction cannot be ascertained prior to arrival, the overfly procedure should be used. The pilot should overfly or circle the aerodrome at least 500 ft above the circuit altitude, usually 2,000 ft or more above aerodrome elevation. When the circuit direction has been determined, the pilot should position the aircraft to a point well clear of the circuit (normally the non-active side of the circuit), before descending to the circuit altitude applicable to the aircraft’s performance (see Figure 3).
CAUTION Be aware of traffic joining the circuit by the recommended overfly procedure, especially if climbing to depart overhead the aerodrome.
CAUTION Pilots should not descend into the active side of the traffic circuit from above because of the difficulty of seeing – and being seen by – aircraft directly below the aircraft’s flight path (see Appendix 1 for a more detailed diagram of the traffic circuit and overfly procedure).