Bash, shell - multiple LFTP commands in one script - bash

Question

I've been trying to solve relatively small problem with moving some files across FTP servers but no luck so far.
In a nutshell this is what I'm doing, I have three servers:
SourceSFTP
TargetSFTP
Target_2_SFTP
The script is supposed to do the following
Connect to SourceFTP
Grab all files
Loop through files
Call function that takes file as parameter and does stuff to it, let's call it postfunc()
Drop the files to TargetSFTP
The problem occurs when inside postfunc I put another call to lftp to transfer file to Target_2SFTP. The command is executed properly (I can see the file moved) but then the number 5 never happens.
This is the script I have:
function postfunc() {
the_file=$1
lftp<<END_SCRIPT2
open sftp://$Target2SFTP
user $USERNAME $PASSWORD
cd /root
put $the_file
bye
END_SCRIPT2
}
echo "Downloading files from $SOURCE_SFTP"
lftp -e "echo 'testing connection';exit" -u $SOURCE_USERNAME,$SOURCE_PASSWORD $SOURCE_SFTP
lftp -e "set xfer:clobber true;mget $SOURCE_DIR*.csv;exit" -u $SOURCE_USERNAME,$SOURCE_PASSWORD $SOURCE_SFTP || exit 0
files=(*.csv)
batch=10
for ((i=0; i < ${#files[#]}; i+=batch)); do
commands=""
# Do some stuff
for((j=0; j < batch; j+=1)); do
commands=$commands"mv source_dir/${files[i+j} archivedir/${files[i+j]};"
postfunc ${files[i]}
done
echo "Archiving batch..."
lftp -e "$commands;exit" -u $SOURCE_USERNAME,$SOURCE_PASSWORD $SOURCE_SFTP
lftp<<END_SCRIPT
open sftp://$TARGET_SFTP
user $TARGET_USERNAME $TARGET_PASSWORD
cd $TARGET_DIR
mput dirr/*
bye
END_SCRIPT
done
Hopefully I'm missing something obvious... At the moment even if I move one file "Archiving batch" never shows up, if I remove contents of postfunc() everything executes correctly