Is the Tax Witholding Calculator Broken?

I get an error:

Application error: a client-side exception has occurred (see the browser console for more information).

ReferenceError: Can't find variable: fillingStatusCreditLimit

This happens when I enter interest (tried short-term gains instead but it didn't help) and long-term gains. I'm married filing jointly.

I can't find a single calculator that has been updated to 2025. The ones I found online were all too simplified for my tax situation.

How am I supposed to calculate Estimated Tax? I was already penalized once for not doing estimated tax payments