Out-of-stock Bundle items mess up page layout

Hi
We find that when an out of stock item is in a product bundle that it messes up the page layout. It creates a 3rd column for us.
When I remove the out of stock item from the bundle everything looks normal again.

I thought it might be the stock notification message but I disabled it for the product and we still get the page layout messed up.

Here are two pages with the issue:
https://archerypark.nz/product/complete-kids-bow-set/
https://archerypark.nz/product/complete-mini-kids-bow-set/

This one is how it should look:
https://archerypark.nz/product/black-hunter-longbow-beginner-complete-set/

The page I need help with: [log in to see the link]