i have a batch class  with code

public class BatchDeleteEvents implements Database.Batchable<SObject>, Database.Stateful, Database.AllowsCallouts {
    
    private String query;
    private String pageToken ;
    private String CalendarId;
    private String accessToken;
    public BatchDeleteEvents(String CalendarId, String accessToken){
    
        this.query = 'Select Id, Name from Event__c'; // Query to get the CalendardID (Google ID)
    this.CalendarId =CalendarId;
    this.accessToken =accessToken;
    }
    
    public Database.Querylocator start(Database.BatchableContext BC){

        return Database.getQueryLocator(query);
        
    }
    
    public void execute(Database.BatchableContext BC, List<sObject> scope){
    System.debug('Entered in delete Batch');
    for(Event__c c : (List<Event__c>)scope)
     GCalendarUtil.doApiCall(null,'DELETE','https://www.googleapis.com/calendar/v3/calendars/'+CalendarId+'/events/'+c.name,accessToken);
       
        
        delete scope;
        }
    public void finish(Database.BatchableContext BC){   
      for(CalendarSettings__c c: [Select Id, Name, CalendarId__c,CalendarQuery__c,FieldToDisplay__c from CalendarSettings__c])
         {  BatchPublicCampaignsToGoogle bjob = new BatchPublicCampaignsToGoogle(c.CalendarQuery__c,c.CalendarId__c,c.FieldToDisplay__c);
            Database.executeBatch(bjob,9); // This is set to process 9 records, allowing 1 extra callout for refresh token in case needed.
        }
        }
        
        }

and i am running it with batch of 9

BatchDeleteEvents del = new BatchDeleteEvents(c.CalendarId__c,accessToken);
Database.executeBatch(del,9);

and i am facing error

FATAL_ERROR|System.DmlException: Delete failed. First exception on row 0 with id a0290000007fCbEAAU; first error: ENTITY_IS_DELETED, entity is deleted: []

Class.BatchDeleteEvents.execute: line 26, column 1

there is no place where i am using delete command why i am facing this error any one please help ??