When deleting a sub-page under services, make sure to remove the item from the services main page as well.
First go to appearance > page builder then select Services template to edit.
Click the downarrow of the feature you want to delete to expand it. Click the Delete button. Click Save Template button if you are done to save your update.
Next, go to Menus, click the downarrow of the sub-item block to expand it then click Remove button. Make sure to click the Save button to save your changes.