Not able to reatain the position of CheckBox state in Viusalforce Page

Please Review my Code:: I have Created a Custom Component In which I have Created Check-boxes in from from each record and Now I want to retain there position but it is not happening as well my wrapper is fine can anybody please tell me what is the mistake.

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public class PaginationCompController {
public List<String> selectedFields{get;set;}
public String selectedObject{get;set;}
public String query{get;set;}
Public ApexPages.StandardSetController ssc{get;set;} 
public List<sObject> allRecords{get;set;}
public Integer Size{get;set;}
public Integer pageNumber{get;set;}
public ID recId{get;set;}
public List<WrapperClass> listOfWrapper{get;set;}
//This method will called only once autmatically by the actionfuntion component and Initialize the ssc by the query
public void show(){
    //get the query in the form of the String     
        //automatically Called By Action
        allRecords();
    
}
 

//This method will return the list of all Records
public List<sObject> allRecords(){
    allRecords = ssc.getRecords();
    System.debug('this called' + allrecords);
    pageNumber = ssc.getPageNumber();
    recordsInWrapper();
    return allRecords;      
}

/*============================================    Methods for Pagination   =============================================*/
public void first(){
    ssc.first();
    allRecords();
}
public void next(){
   
    ssc.next();
    allRecords(); 
}

public void previous(){
    ssc.previous();
    allRecords();
}
public void last(){
    ssc.last();
    allRecords();
}

public void pageSize(){
    ssc.setPageSize(size);
    allRecords();
}

public void finalPageNumber(){
    ssc.setPageNumber(pageNumber);
    allRecords();
}


/*==============================================MAINTAIN THE CHECKBOXES ===============================================*/
public Map<Id,sObject> mapOfSelectedRecords;
public void selectedRecords(){   
    mapOfSelectedRecords = new Map<Id,sObject>();
    if(listOfWrapper!=null){
        for(WrapperClass ob : listOfWrapper){
            if(ob.isSelected == true){
                //putting all the checked records to the Map
                mapOfSelectedRecords.put(ob.obj.id, ob.obj);
            }
            else{
                //Remove funtion is used to remove the all the Records which first selected and later deselected
                mapOfSelectedRecords.remove(ob.obj.id);
            }
        }
    }
    System.debug('The map of selected records is ' + mapOfSelectedRecords);
}
/*============================================================= WRAPPPER CLASS =============================================================================*/    
public class WrapperClass{
    public Boolean isSelected {get;set;}
    public sObject obj {get;set;}  
    public WrapperClass(sObject obj,Boolean isSelected)
    { 
        this.isSelected = isSelected;
        this.obj = obj;
    }
}

public List<WrapperClass> recordsInWrapper(){
    selectedRecords();
    System.debug('Inside the records in Wrapper Methods The Map of selected Records is : ' + mapOfSelectedRecords);
    listOfWrapper = new List<WrapperClass>();
    System.debug('The wrapper data is ' +listOfWrapper );
    System.debug('The all Records are ::::: ' + allRecords);
    for(sObject sObj : allRecords){
        if(mapOfSelectedRecords.containsKey(sobj.id)){
            System.debug('Key is Present');
            listOfWrapper.add(new WrapperClass(sObj,true));
        }
        else{
             System.debug('Key is Not Present');
        listOfWrapper.add(new WrapperClass(sObj,false));
        }
    }
    System.debug('The wrapper data is ' +listOfWrapper );
    // System.debug('The Checked wrapper data is ' +asRecordsList );
    return listOfWrapper;
}  

}