Just checked 25.8 on my moto phone.
Try this:
Think of your touch as controlling three different actions and you have to choose which one you want.

1. TAP selects/opens what you touch (playlist or song chart)

2. TOUCH & MOVE(your finger), scrolls through the list
no matter how long you hold it
(Just don’t lift your finger off the screen or you start over)

3. TOUCH & HOLD(don’t move your finger), after a ~1sec pause there’s both a tactile and visual indication that you have selected an item to re-position within the list.

It seems that the #3 action is causing your issue.
Practice using the #2 action and you’ll be in scroll-mode every time.

I can see how the change without any notification or instructions could be disconcerting.

)BOB