Why does grep generate "xterm-256color"

I'm working with Ubuntu 16.04.4 LTS. I used Mobaxterm to login remotely. When I execute grep, something weird happened... me@mymachine:/data/myserver/log/server$ grep -rnH 23423 ./*log ... # outputs of the grep command me@mymachine:/data/myserver/log/server$ xterm-256colorxterm-256colorxterm-256colorxterm-256color I can't understand why I got the last line. It seems that someone typed automatically xterm-256colorxterm-256colorxterm-256colorxterm-256color after executing the command grep -rnH 23423 ./*log. I have to delete it or type Ctrl-c every time. It's really boring.