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Hello @buptrick
The plugin estimates the form height to avoid CLS or reduce its impact. However, as you have cached the webpage with the “WP Fastest Cache” plugin, your website loads a page’s copy from the cache with outdated height. Please purge the “WP Fastest Cache” and browser’s cache and re-visit the webpage to allow the plugin to recalculate the height and “WP Fastest Cache” to create a cached copy of the webpage with the correct height value.
Best regards.