Conflict with two magento extension updating the grandtotal

I have a magento extension giving a credit point to the customer and I added a custom extension giving a custom discount to the customer. The problem is that when i use the custom extension the credit point one is not adding to the grand total.
My custom extension has the following config.xml

< ?xml version="1.0"?>


    
        0.1.0
    



    
        
            
                
                Ei_Creditpoint
                    singleton
                    HK_Customdiscount_Model_Observer
                    setDiscount

the credit point extension has the following config.xml

            < ?xml version="1.0"?>



1.0.1





standard

Ei_Creditpoint
creditpoint






ei/creditpoint.xml







Ei_Creditpoint.csv








admin

Ei_Creditpoint
creditpoint








ei/creditpoint.xml







Ei_Creditpoint.csv







                
10/10
100/10
0
0
      





Ei_Creditpoint_Block



Ei_Creditpoint_Block_Sales_Order_Totals




Ei_Creditpoint_RW_Adminhtml_Block_Sales_Order_Totals
Ei_Creditpoint_RW_Adminhtml_Block_Sales_Order_Invoice_Totals
Ei_Creditpoint_RW_Adminhtml_Block_Sales_Order_Creditmemo_Totals





Ei_Creditpoint_Helper






creditpoint/sales_quote_address_total_creditpoint
set_custom_discount
tax






creditpoint/sales_order_total_invoice_creditpoint
set_custom_discount
tax






creditpoint/sales_order_total_creditmemo_creditpoint
set_custom_discount
tax








singleton
creditpoint/observer
deductCreditAmount






singleton
creditpoint/observer
revertCreditPoints






creditpoint/observer
updatePaypalTotal






creditpoint/observer
invoiceSaveAfter







*


*






Credit Points Discount
creditpoint_amount
creditpoint/sales_pdf_creditpoint
7
0
650





Ei_Creditpoint_Model
creditpoint_mysql4


Ei_Creditpoint_Adminhtml_Model


Ei_Creditpoint_Model_Mysql4


customer_credit_point







Ei_Creditpoint
Mage_Eav_Model_Entity_Setup


core_setup




core_write




core_read