with a two finger drag up on the trackpad, the knob is turned down
with a three finger drag up on the trackpad, the knob is turned up
The way it used to work was both types of upward drag turned the knobs up, but at different rates.
Now, the two finger drag is the slower rate, as it was before, but it’s in the opposite direction.
Just in case it mattered, or wasn’t done on purpose.
2-finger drag is the same as a mouse wheel scroll.
3-finger drag is the same as holding the mouse button while moving the mouse.
If they both work in opposite directions, you might just want to invert your scroll direction (System Preferences >> Trackpad >> Scroll & Zoom >> Scroll Direction: Natural).