i still dont get what you are trying to do.
all you have to insert is a checkbox, that contains a value already inserted to the database?:
<input type="checkbox" name="check_<?php echo $RepeatSelectionCounter_1; ?>" id="check_<?php echo $RepeatSelectionCounter_1; ?>" value='<?php echo $row_rsPH["ID"]; ?>'/>
this does not make any sense.
it also does not look like you have made any bindings on the second step of the multiple record insert for fields that should be inserted.