I wish it was that simple. I've ruled out every cause that I can think of. Sorry, it's not me. It's you.

With Zeta the host can customize the editor Toolbar.

This is what I see with a desktop computer using Firefox and  Zeta in your forum. I switched to Classic to see if the editor looked off but the Post Waiting period is preventing me from seeing the editor.

Even if the cause is Delphi - we'd still need to know what device/browser and UI (Zeta or Classic View) you are using. With Zeta the host can customize the editor Toolbar.

Can you give us a screenshot of what you see here?