Why output is ahead of my command rather than after?

[yeqown]

sample code: https://github.com/yeqown/go-qrcode/blob/main/example/use-tereminal-writer/main.go

I tried use termbox in my project, but after I run my example, I didn't see any thing after my command but find the output ahead of my command. like this:

Actually, I start a new session in iterm, ahead of my command should be nothing. So what cause this? help plz