I'm only occasional with using an Opal card; I hope a regular user in the know might be able to answer my question.
Tonight (Sunday) I took a train at around 23:30. When I swiped on my Opal card it said -$2.60 which makes sense - it's Funday Sunday. But by the time I swiped off it was about 00:30 Monday and it indicated -$5.94 for the trip.
Would I have been better off not swiping off?
Firstly it's a tap on/off, not a swipe on/off.
Secondly, it shouldn't have taken -$2.60 off as you tapped on unless you didn't tap off last time although I didn't think that this runs between days like that. It only deducts funds as you tap off.
And yes, you probably would've been better not to tap off. But you kind of need to in order to get through the gates at main stations.