Across the network, including meta sites, there are opening and closing curly braces above question titles:
Looking at the HTML source, it can be observed that those surround a few tags including <div id="redirect-action-modal-container"></div>
and multiple <script>
tags:
<div id="content" class="snippet-hidden"> { <div id="redirect-action-modal-container"></div> <script type="application/json" data-role="module-args" data-module-name=" islands/redi... <script defer src="https://cdn.sstatic.net/Js/webpack-chunks/svelte.en.js?v=aef9580d5c... } <div itemprop="mainEntity" itemscope itemtype="https://schema.org/Question">
Those braces should be removed.
{ }
)