Same! At first I thought it might be a Firefox problem, but it's equally broken in Chrome.

Predictably it's a React site, using some widget library (MUI) that is going out of it's way to provide a text input that is inferior to what's built in to any modern browser. Great!

I agree that clicking on what appears to be a placeholder but instead acts as a label should at the very least focus the input box so you're prompted to type in it. However the UI overall is pretty simple and clean.

Uhh.. damning praise. I think that can be rephrased as: "It's pretty, but despite being almost the simplest thing you can imagine, it still has ridiculous, unnecessary usability problems"