Puzzled by SBCL evaluating some Scheme code

Hello,

I am playing a bit with Guile and proceed along

  https://scheme.com/tspl4/start.html#./start:h2

In a Scheme, exercise 2.2.3o

  ((car (list + - * /)) 2 3)

evaluates to 5. Of course, in Common Lisp this has to be written as

  (funcall (car (list (function +)
                      (function -)
                      (function *)
                      (function /)))
           2 3)

or, using reader macros, as

  (funcall (car (list #'+ #'- #'* #'/)) 2 3)

or even, but not strictly identical anymore,

  (funcall (car '(+ - * /)) 2 3)

However, at one point I managed to paste an expression into the wrong
REPL, SBCL instead of Guile, and got

  (list + - * /)

evaluated by SBCL as

  (NIL (LIST + - * /) NIL NIL)

Oops?! Even better, when I tried this again immediately, I got

  ((LIST + - * /) (LIST + - * /) (NIL (LIST + - * /) NIL NIL)
   ((NIL (LIST + - * /) NIL NIL)))

So there seems to be some "history expansion" going on (for "*"). But
how to explain the first result with the NILs and the expression itself?

Pointers welcome!

Axel