This bug seems to have been introduced in a recent version of Podium. when editing note attack velocities, the “hotspots” for each note are offset by half. If you click on the righthand side of a bar, it edits the attack velocity for the note next to it instead of the note you clicked on.
Also, a feature request while I’ve got your attention :). It would be handy if holding the shift key while modifying note attack velocities “locks” the value you’re on, so mouse movement up and down doesn’t adjust the value. This would allow you to quickly drag along a whole group of note velocities and set them to the same level, which is currently a very painstaking task.