The issue is that the tabs decides the height of the content before it's contents fully render. Since that scheduler loads asynchronously, the height of the tab container is smaller than the content height.

Clicking between tabs, clicking inside a tab, or resizing the screen resets the height though. Try adding this to the page header code injection area of that page. This listens for when the tabs is ready, waits 1 second, and then simulates a resize:

<script>
document.addEventListener('wmTabs:ready', function(event) {
    window.setTimeout(() => {
        window.dispatchEvent(new Event('resize'))
    }, 1000)
});
</script>
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Can I hire you to make further customizations to this plugin?