Stop Emacs font-lock from reducing the font size of symbols in Lisp modes

When font-lock colourises my Lisp buffers (in clojure-mode and emacs-list-mode, at least, so I'm assuming all Lisp modes are affected as well), the font size of my symbols is getting reduced. In this case, I think a picture is worth a thousand words:

As you can see, this leads to the indentation looking wrong, due to the symbols arena-ended-games-limit and game-status appearing in a smaller font than the other text in the buffer.

Does anyone know where this is being configured, and how I can turn it off?

I've Googled and read through lots of Emacs Lisp files to no avail, but as I don't really know what I'm looking for, I may have overlooked an obvious answer.

In case it matters, here is the ELPA package prologue from my init.el:

(require 'package)
(add-to-list 'package-archives
             '("melpa" . "http://melpa.milkbox.net/packages/"))
(add-to-list 'package-archives
             '("marmalade" . "http://marmalade-repo.org/packages/") t)

(package-initialize)

(when (not package-archive-contents)
  (package-refresh-contents))

;; packages
(defvar my-packages '(starter-kit
                      starter-kit-lisp
                      starter-kit-bindings
                      auto-complete
                      rainbow-delimiters
                      clojure-mode
                      cider
                      magit)
  "A list of packages to ensure are installed at launch.")

(dolist (p my-packages)
  (when (not (package-installed-p p))
    (package-install p)))

I'm fairly certain that nothing in starter-kit / starter-kit-lisp is doing this, as I've read through the source pretty closely, but one never knows.

Thanks to legoscia's comment, I've been able to figure out that the face that is responsible is font-lock-function-name-face, which sets the font family to Verdana, and the height to 0.9. Once I'd figured this out, I used the customise utility to remove the face and height changes, which resulted in the following being added to my init.el:

(custom-set-faces
 '(font-lock-function-name-face ((t (:foreground "LightSkyBlue" :weight bold)))))

Now everything lines up nicely!