This bug was introduced in E-Prime 22.214.171.124 (Update 1).
This bug has been fixed in E-Prime 126.96.36.199 (Update 2).
E-Studio Toolbox does not display the PackageCall Shortcuts for all of the PackageFiles that are loaded into the experiment.
If you load an experiment with multiple PackageFiles into E-Studio, then the Toolbox is initially updated to display a Toolbox Group Header of PackageCall shortcuts for each PackageFile loaded in the experiment. However, after the first PackageCall Group Header has been selected (which reveals the available shortcuts), selecting a different PackageCall Group Header results in the same shortcuts from the previously selected PackageCall Group Header being displayed. In other words, while a unique Toolbox Group Header is displayed for each PackageFile loaded into the current experiment, each group header points to a single set of PackageCall shortcuts.
There is no workaround for this bug.
Upgrade to E-Prime 188.8.131.52 (Update 2) or later.