Explain the problem you see
If multiple values are selected in a field used to group-by (say Field:Type, Value: PodCast & Video are selected) - that node should show up under PodCAST and under Video in the group-by Type View option. Or at least have the option to show it in both places. I'm told there is a use case for it not to show up in both places.
Why is this a problem?
The resulting group-by list / table can be misleading. In the above example, when you group by TYPE, it won't show any video. Thus, it would be logical to think you have nothing in that category - when in fact, you do - it's just showing up under PODCAST as Video was the second selection.
I have several such sorts in the FAQ Slack workspace. And if people are looking only for videos, they will not find that one. This is especially true of my "TOPIC" group-by as any Video or Article will probably cover many topics.
Suggest a solution
If a group-by field has multiple values, enable allowing the node to show in all selected values in a group-by view option.