Confusion and inconsistency regarding groups

[Chaoscontrol]

I have done a group per room. And also added my devices from the library.

Taking as an example my Studio (group) and my Utility room (group).
After creating the group and adding the member, you can see how the UI shows the device inside the group instance.
However, when doing the same for Utility room, this doesn't happen.

I'm pretty sure this is some UI bug, as it happened with some other room groups, it showed the device inside (which is confusing on itself as it's a duplicate from the library entity, and it included the group entities inside that device as well which feels wrong). But after some time (reload or something, I can't say) the group shows empty (visually) again.

Can someone help me understand a bit?

[Chaoscontrol]

A slightly related issue/confusion as well. I'm trying to debug this chart.

Specifically, what bothers me are the missing bit in Living room, and the extra bit in Studio.

You can see how the Living room group includes just those 2 sensors, just as the chart shows. Why then it shows more energy than those 2 sensors have combined?

Similar issue but the opposite happens with Ground floor > Studio. This is my Ground floor config. If it just includes those subgroups, why does Studio have a surplus that is not "included" within Ground floor?