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Hello,
The theme (or some custom JavaScript via the theme) is breaking the buttons by trying to insert an icon that indicates external links. Specifically, the ‘screen reader only’ element is the issue:
<span class="sr-only">This off-site link opens in new tab or window.</span>The linkHelpers() function in /wp-content/themes/insite-starter/inc/assets/js/custom.js is the source of that element.