Horizontal line in accordion

I just updated a dev site to Pro 6.7.12 and added my first accordion element on the site. There is a black horizontal line showing before the accordion header text. I was able to remove it using:

.x-acc-header-content::after {
  content: none !important;
}

But I’m wondering why it was there to begin with.

This is what it looked like when I first added the element:

Hello Danni,

Thanks for posting in! We could not replicate the issue on our local testing servers. What you are experiencing could be caused by a caching issue. Make sure to clear all your caches.

Did you experience this issue on a fresh WP install? We would be happy to double-check your site if we can log in. You can create a secure note in your next reply with the following info:
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Best Regards.