Notes lost when merged in modified order

Do the following:
1. Sort notes as modified from newer to older
2. Make 3 new notes (note1, note2, note3).
 (If we merge these notes the text will be note3-note2-note1 but we want the opposite).
3.Invert the order of list
4. Press [end] to go to the bottom of the list.
5. merge the 3 notes
6. Note1 and note3 are lost! we see only note 2.
Same problem does not happen when the notes displayed by creation order.