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If you have a maven project with multiple modules and want to create a project group for it, you will select the top-project as master project. The project group now opens all projects which are directly referenced in the master's pom. But if you have sub-subprojects, they are not opened but only displayed as modules of the subproject. Each time you open the project group, you will have to manually open all modules. I would love to see a checkbox "open all modules" to solve this.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss