Hi,
please open one of these events to see to which calendar they belong to. Then open "Settings > Visibility/Download" in CalenGoo and tap that calendar until it is marked with a red dot (or a white dot if it is an iOS calendar). Afterward return to the calendar view and check if they are gone.
Does that work?
Please try this and don't hesitate to contact me again if you still have problems or if you have any questions!
Kind regards
Dominique Gunia