Doubled resume upload

[Psi]

When the resumed upload is finished FlashFXP
starts to upload the file all over :

SYST
215 UNIX Type: L8 Version: BSD-199506
CWD /audio/
250 CWD command successful.
PWD
257 "/audio" is current directory.
TYPE A
200 Type set to A.
PORT 213,76,104,42,4,137
200 PORT command successful.
LIST
150 Opening ASCII mode data connection for '/bin/ls'.
226 Transfer complete.
TYPE I
200 Type set to I.
PORT 213,76,104,42,4,138
200 PORT command successful.
APPE raj.wma
150 Opening BINARY mode data connection for 'raj.wma'.
226 Transfer complete.
Resumed: raj.wma 3Â 419Â 466 bytes in 21:00 (2,65 KB/Sec)
PORT 213,76,104,42,4,177
200 PORT command successful.
STOR raj.wma.
150 Opening BINARY mode data connection for 'raj.wma'.

Why ?