I’m seeing this problem, also only ie11(haven’t tested edge yet) and don’t have NextGEN Gallery installed.
I also see the same error as @jopienl: ReCAPTCHA couldn’t find user-provided function: contact_form_7_recaptcha_callback
I’m noticing that sometimes the captcha loads others it doesn’t.
-Most often loads when the dev tools are open.
-Most often doesn’t work when the dev tools are open. Of course
-Although right now dev tools are open and it’s not working. So it’s not 100% consistent.