My SmartShunt shows a current reading even when there is no load and the battery is not charging?

In this situation it may be necessary to perform a zero current calibration. Only perform this procedure in case the battery monitor shows a current while you are absolutely sure that there is no actual current flowing.
The only way to be sure is to physically disconnect all wires and cables connected to the SYSTEM MINUS side of the shunt. Do this by unscrewing the shunt bolt and removing all cables and wires from that side of the shunt. The alternative - switching the loads or chargers off, is NOT accurate enough as this does not eliminate small standby currents. Ensure that there really is no current flowing into or out of the battery (disconnect the cable between the load and the shunt), then press CALIBRATE in the VictronConnect app.
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