Talent points is not reasonable

Hello, GGG.
I am a loyal player of the dark class, recently encountered a puzzling problem, hope GGG to make an adjustment or give an explanation Thank you!
The problem is about [points on talents], on the talent panel there is a display of the first set and the second set of added gameplay, but when we recently studied, we found that the talent points between I and II, when added, took up the overall talent, and did not return between the two...
For example, if I put the Lightning Rod on the first set, and the second set has no points, it is reasonable to say that when cutting the second set, the one point of the Lightning rod should be returned, rather than taking up the overall talent points, otherwise what is the talent significance of these two sets of equipment? Can not reflect the feeling of two sets of talent, so I hope GGG can make adjustments! Thank you!
The talent principle of I II sets of equipment is that when switching the second set of equipment, the 24 points of the first set of talents are invalid, so the normal understanding is that after the talent points of the first set of points are good, when cutting the second set, the 24 points of the first set should be returned, rather than taking up the whole 24 points (the 24 points should be shared between the two sets of weapons)!

Once you have spent points on Set I, the points you spend on Set II will not lower your total points. It works as intended.

Can the effects pointed out in the first set be reflected in the second set?