mysterious two line shell?

[Dy7SLyTq]

so ill run a command on my linux terminal (im on ubuntu) and then clear it. then i go to check my facebook, and come back to the shell, and its like ive hit enter, because there is another line below the one that happens because i cleared. its not a big deal, i just want to know why it happens across what is now multiple releases and reinstalls of ubuntu

[keskiverto]

Please, describe "clear terminal" and "come back to shell".

[Dy7SLyTq]

so i run the command clear and my terminal only shows:
dtscode@dtscode-Latitude-E6410:~$

i go to check my facebook or something, ie something that makes the terminal window inactive and come back to it and i see:
dtscode@dtscode-Latitude-E6410:~$
dtscode@dtscode-Latitude-E6410:~$

[keskiverto]

I don't recall ever seeing such. However,

- I use xterm, not any of the new terminals
- I don't clear. If I would, it would be with ctrl-l
- In XFCE a window gets focus after delay when mouse is over it, so no clicking or keyboard

I bet our usage differs in so many ways that there is no relevance.