I checked and there’s some JavaScript that seems to be automatically changing some mailto: links to this odd /cdn-cgi/l/email-protection link, which doesn’t work.
You could try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.