It looks like you have a dynamic selection set for each that would try to make every option selected. If you just remove that then the first one will be selected instead of the last.
So for instance in the first list this code:
<option value="<?php echo $row_Make_Recordset['make']?>"<?php if (!(strcmp($row_Make_Recordset['make'], $row_Make_Recordset['make']))) {echo "selected=\"selected\"";} ?>><?php echo $row_Make_Recordset['make']?></option>
should be:
<option value="<?php echo $row_Make_Recordset['make']?>"><?php echo $row_Make_Recordset['make']?></option>