[CentOS] Apparent bug in logwatch's reporting of number of email by sendmail

# rpm -q sendmail logwatch
sendmail-8.13.8-8.1.el5_7
logwatch-7.3-10.el5

One host sends just one email per day, the daily logwatch report. 
Here's /var/log/maillog entries from yesterday (hostnames are changed to 
make designations in this conversation more intuitive):

Mar 12 04:02:18 srchost sendmail[27151]: t2C82Bjr027151: from=root, 
size=2485, class=0, nrcpts=1, 
msgid=<201503120802.t2C82Bjr027151 at localhost.localdomain>, 
relay=root at localhost
Mar 12 04:02:19 srchost sendmail[27383]: t2C82IiB027383: 
from=<root at localhost.localdomain>, size=2756, class=0, nrcpts=1, 
msgid=<201503120802.t2C82Bjr027151 at localhost.localdomain>, proto=ESMTP, 
daemon=MTA, relay=srchost [127.0.0.1]
Mar 12 04:02:19 srchost sendmail[27151]: t2C82Bjr027151: to=recip at dest, 
ctladdr=root (0/0), delay=00:00:08, xdelay=00:00:01, mailer=relay, 
pri=32485, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent 
(t2C82IiB027383 Message accepted for delivery)
Mar 12 04:02:20 srchost sendmail[27385]: t2C82IiB027383: 
to=<recip at dest.com>, ctladdr=<root at localhost.localdomain> (0/0), 
delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=122756, 
relay=dellap.mousecar.net. [192.168.0.26], dsn=2.0.0, stat=Sent 
(t2C82Jh3016227 Message accepted for delivery)
Mar 13 04:02:13 srchost sendmail[30541]: t2D82ATM030541: from=root, 
size=2589, class=0, nrcpts=1, 
msgid=<201503130802.t2D82ATM030541 at localhost.localdomain>, 
relay=root at localhost

These four lines describe the sending of just one email.  (The loglevel 
for sendmail is set at 9, the default.)  I don't know why, but logwatch 
reports that two emails were sent yesterday.  Could it be because there 
are two distinct msgids?
Here's the relevant section of the logwatch report:

--------------------- sendmail Begin ------------------------

  STATISTICS
  ----------

  Bytes Transferred:      5241
  Messages Processed:     2
  Addressed Recipients:   2

  ---------------------- sendmail End -------------------------

I'd also like to know where/how logwatch is getting the number for 
"Bytes Transferred"; it doesn't seem to correspond to anything.

So, unless I'm missing something, that's two problems.  Does anyone see 
any others...?  or have a plausible explanation for these inconsistencies?

tia.