I think this is a bug?
On the iOS app if, when in the the Today view, you swipe your finger on the pulse graph from right to left it kinda shifts the marker across but the transaction list remains as today.
Moving down the transaction list fixes it but if you continue to swipe the pulse graph back in time it sorta gets worse showing random dates in the transaction list and the vertical white line will sometimes just vanish unless you tap a position on the graph.
Edit: oh, I think I get what’s happening? The graph when swiped moves in months but the indicator moves relative to where it was before but the transaction list moves between the start and ends of months? I think.