I poked around at this a bit.
If you enable nrepl's logging (use nrepl-toggle-message-logging) you will 
see something like this:
(-->
  id         "18"
  op         "eval"
  session    "86281560-e467-47c4-869d-043b03f5c546"
  time-stamp "2019-08-07 12:23:33.769213028"
  code       "(ns org-babel-clojure.core)
(* 1 2 3 4)"
)
(<--
  id         "18"
  session    "86281560-e467-47c4-869d-043b03f5c546"
  time-stamp "2019-08-07 12:23:33.775780419"
  ns         "org-babel-clojure.core"
  value      "nil"
)
(<--
  id         "18"
  session    "86281560-e467-47c4-869d-043b03f5c546"
  time-stamp "2019-08-07 12:23:33.776704332"
  ns         "org-babel-clojure.core"
  value      "24"
)
(<--
  id         "18"
  session    "86281560-e467-47c4-869d-043b03f5c546"
  time-stamp "2019-08-07 12:23:33.777133786"
  status     ("done")
)
(<--
  id                 "18"
  session            "86281560-e467-47c4-869d-043b03f5c546"
  time-stamp         "2019-08-07 12:23:33.780311930"
  changed-namespaces (dict)
  repl-type          "clj"
  status             ("state")
)

The connection returns two values,  first 'nil' then '24', and function 
nrepl--merge concats these into the incorrect response that org-mode pastes 
into your doc.

So I am not sure where to ask - it doesn't look like org-mode's ob-clojure 
code is doing the wrong thing, but it does seem like something changed 
between 9.1.x and 9.2.x.

If you're on clojurians slack there is a cider channel where I think they 
might be able to clear up what's happening with that double return.

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