Solved .
change the checkbox "name" "id" into
<input type="checkbox" name="WADA_RepeatID_CustomerID_<?php echo $RepeatSelectionCounter_1; ?>" id="WADA_RepeatID_CustomerID_<?php echo $RepeatSelectionCounter_1; ?>" value="<?php echo $row_SelectFamily['CustomerID']; ?>" />
and delete the hidden text
<input type="hidden" name="WADA_RepeatID_CustomerID_<?php echo $RepeatSelectionCounter_1; ?>" id="WADA_RepeatID_CustomerID_<?php echo $RepeatSelectionCounter_1; ?>" value="<?php echo $row_SelectFamily["CustomerID"]; ?>" />
Then everything goes well , only the records checked will be update!
YES!
Simple.
Even though I have tried many hours before I ask for some help ! ^^"