some messages *.eml after changes from *.msg (outlook 2010 > thunderbird 38.5) lose receiving dates

hello friends,

i try to export emails from outlook to thunderbird, but some messages lose receiving date format...

1 email on outlook don't have sending date on upper right corner.. but rest of emails has date receiving = sending
2 in header You can see date of receiving, but it's a date of avast.. (x-antivirus: avast! (VPS 150725-1, 2015-07-25)
3 email on outlook before open has reciving date on column 2015.07.26 22:10 o'clock

what's the reason of it ?

what's a pity that it's possible to attach file to recognize... :(

I attach headers:
From - Tue Apr 19 22:50:53 2016
X-Mozilla-Statu­s: 0001
X-Mozilla-Statu­s2: 00000000
X-Mozilla-Keys:
Return-Path: <>
From: <>
To: <>
Subject: =?utf-8?Q?Bilet­_jednorazowy_e-­podr=C3=B3=C5=B­Cnik.pl?=
Message-ID: <1964441729.391­17.143794140821­0.JavaMail.tomc­at@Helheim-2>
MIME-Version: 1.0
Content-Type: multipart/mixed­;
boundary="----=­_NextPart_000_0­683_01D19A79.8A­67BDF0"
X-Mailer: Microsoft Outlook 14.0
Thread-Index: AQJY3g1EBZI6n3A­E0PaJ9+SZGGtw6A­==
x-antivirus: avast! (VPS 150725-1, 2015-07-25), Inbound message
x-antivirus-sta­tus: Clean

This is a multipart message in MIME format.

regards