[Old version][Userscript] Burn Reviews (v1.0.0.3)

I’ve got a bit of an issue. I’ve entered my API key into the userscript before clicking “Install” (and then clicking “reinstall” quite a few times), and yet whenever I visit my WK homepage it still gives me the popup message “Please enter your API key near the top of the WanaKani Burn Reviews userscript.” I’ve tried regenerating my API key, and every time I copy and paste it into the userscript and click reinstall, it still gives me this popup. Am I missing something?