It's not exactly a specific addon or has something to do with overlapping. But imagine you toogle a addon which brings up the hudui mode and the addon's GUI.
Now when I open my addon and toggle it off again the ZO_SceneManager_ToggleHUDUIBinding() will be executed and closes both addons because it toggles the whole hudui.
My current state is that maybe I have to look it up in the global table (_G) and detect other addons. They are basically children controls like my addon but there are over 400 other controls.