When you are indicating the element by Check/Uncheck activity, check the strict selector and uncheck the fuzzy and image in the selector option window. Go back to Studio and open the properties of Check/Uncheck activity.
→ Extend the Target option find the Visibility check option select the Interactive option from dropdown.
→ After that find the Wait for Page load option, select the Complete option from dropdown.
Try the above options and let us know it’s working or not.
Hope it helps!!