It's probably because you're not using the same terminal
type as identified in your TERM environment variable.
vi will write an escape sequence to the terminal upon
exit if one is defined in the termcap/terminfo database
for the $TERM you are currently using. If your actual
terminal can't make sense of that sequence it might
attempt to just simply display it.
For example, for an Xterm try setting TERM thus:
export TERM=xterm
assuming your shell is bash; for csh it would be:
setenv TERM xterm
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