[Plugin: Tabbed Widgets] All tabs appear briefly when page loads

Hi,
Love the plugin, just one minor thing – when the page loads all three of the tabbed panels appear for a second or two and then it works fine. Is there a way to fix this?
Here’s the page temporarily:
https://50.22.130.188/~westauck/?page_id=7
(it’s in the News section on the right while testing – not easy to spot! :))
Many thanks!