Maile filtering rules does not work reliable

Sometimes it remains mail in the indbox and if you try to move it yourself, it will not because it is actually already moved but it shown is inbox somehow. If you close the app and restart it, you will see that it is actually moved.
It does not filter mails correctly. Although I am sure that the keyword exist in the body of the message (I have check from raw source of mail) it does not filter it.
Other than that, it works perfectly for me. There is no much difference between airmail 1 and airmal 2.

denizog about Airmail - Lightning Fast Email, v2.1