Different output when running external command

If I start vim from a console and execute ":!ls", the whole vim window
disappears and I can see the output in the console.

If I run vim inside a screen session and execute the same command, the
vim buffer is scrolled upwards so that I can see parts of the vim
buffer and the output of ls at the same time.

It works the same in gvim as in screen plus vim.

Is there a vim option to control this behavior? I would like the
output to always appear below the vim buffer. Or, the more importan
thing is that I don't want to see output of previous command when I
run a new command.

--
Rickard Lindberg

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