need some advice with logwatch error report

[GuiPos]

i receive yesterday my logwatch report with this strange error message:

i cut some of the entries [ all the same error message 100x ]

error: "ftp.xxxxxxxxxxxxxxxx1.com" address/port(xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxx199.com"
error: "ftp.xxxxxxxxxxxxxxxx2.com" address/port(xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx1.com"
error: "ftp.xxxxxxxxxxxxxxxx3.net" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx2.com"
error: "ftp.xxxxxxxxxxxxxxxx4.com" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx3.net"
error: "ftp.xxxxxxxxxxxxxxxx5.com" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx4.com"
error: "ftp.xxxxxxxxxxxxxxxx6.com" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx5.com"
error: "ftp.xxxxxxxxxxxxxxxx7.com" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx6.com"
error: "ftp.xxxxxxxxxxxxxxxx8.com" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx7.com"
error: "ftp.xxxxxxxxxxxxxxxx9.com" address/port (xxx.xxx.xxx.160:21) already in use by "ftp.xxxxxxxxxxxxxxxx8.com"
xxxxxxxxxxxxxxxx15.net (xxx.xxx.xxx.155[xxx.xxx.xxx.155]) - no such user 'avikaco@xxx-xxx.com'
xxxxxxxxxxxxxxx15.net (xxx.xxx.xxx.155[xxx.xxx.xxx.155]) - no such user 'avikaco@xxx-xxx.com'

i comment out the different domains and ip's from our clients with xxxx.
for a better overview different domains i mark with a number.

a log in in the server via FTP bring up strange results

1:startdir=
1:domain1.com=216.66.18.160
1:220 ProFTPD 1.2.9 Server (ftp.domain2.com) [xxx.xxx.xxx.160]
1:USER domain1user

if i log in to user 1 domain with the right paswords and the right username the message from proftpd says 220 ProFTPD 1.2.9 Server (ftp.domain2.com)

any ideas whats going wrong ???? how i can fix this ???

[GuiPos]

same logwatch errors again today

any help