Unable to reply to comments on frontend

I hope you can help me. I’m really lost about how to proceed. People can leave comments on my website, but whenever someone goes to “reply” to that comment, no comment box is revealed. The page just jumps a bit, but nothing.

I have searched everywhere online for possible solutions, but I have found nothing that works. I’ve disabled many of my recently updated plugins. But nothing is working.

I hope you can help me or point me in the right direction. I’ve included a link to a post on my website with a comment so you can see what I mean.

Thank you.

The page I need help with: [log in to see the link]

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