Hey there! Great question. Based on what I know, Decile Hub's newsletter editor supports text-based formatting, and while HTML editing mode is now available, there are a couple of things that could explain what you're seeing:

• One known issue is that inline images uploaded via the newsletter can be replaced with cached links that expire after roughly 24 hours, which could cause design elements to stop displaying for recipients.
• If your HTML relies on external stylesheets or assets hosted elsewhere, those may not render correctly depending on the recipient's email client.

Since this is a bit specific to your setup, I'd recommend reaching out directly to the team at developers@decilegroup.com or posting in Hub Support so someone can take a closer look at your newsletter link. They'll be able to diagnose exactly what's happening with the formatting for your investors.