Upon alighting, commuter tapped her fare card on the fare card reader when it was in the 'Entry' mode

Ms Wong alighted from the front of the bus, and noticed that the fare card reader display indicated 'Entry' when she tapped her fare card. She paid more than her usual fare.

 
Explanation

There was a higher deduction of fares because in the 'Entry' mode, the fare system will consider a fare card being tapped as the start of a trip (instead of the end of a trip as in Ms Wong's case).

If commuters are alighting from the front of the bus, they may do so by tapping on the fare card reader only after the door opens upon reaching the bus stop. This is when the entrance card reader is switched to 'Entry/Exit' mode, and tapping at this moment will result in the correct fare being deducted.