People Functions Plugin - getgroupsoftype

I'm using the People Functions plugin (v1.0.12) and have a form used for managing user groups. On the form, the function used to get all the groups of our selected group type is 'getgroupsoftype' from the People Functions plugin. The result is that only some of the groups in this group type are being returned. All the groups are public so I don't think group security is the issue here. Are there any known bugs with this function from the plugin? My first thought would be to update to the latest plugin version, but I checked the changelog and don't see anything specifically related to this function. I confirmed the Appian version I'm using is compatible with the plugin. Any advice on this plugin function?

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