I imagine this is due to a customization you’ve made or a theme component you use. I can’t repro here on Meta. Check to see it still happens after disabling themes at your site’s /safe-mode page.
This is one of those “feature-not-bug” things. It’s supposed to be a nice, modern looking style, but if you don’t like it you can adjust with CSS:
#user-card.no-bg .card-content,
#group-card.no-bg .card-content {
margin-top: 50px;
}