I have this exact issue as well, am using contact form 7, do have it implemented properly (this used to work not that long ago, in fact, it just quit recently). php ver 7.4, wordpress 5.4.2, I can get a comprehensive list of other plugins if i need to. Doesn’t appear to be anything css related, there just doesn’t appear to be any content to display where the captcha item is (at least in the source, it doesn’t seem to have anything except the empty containers around where things should actually be)… checking google and the key data, it’s not even being accessed.