Yeah, this doesn't include SS or Medicare taxes, just federal income taxes.

I am only looking at my federal tax bill. That being said the site seems to be giving me different numbers now that I am on a computer at home. I checked my phone (still had the tab open) and it was showing near half what the site is showing now. But now the site shows the new tax bill will save me money, when before it said I would pay more.

The numbers I am getting on my computer are closer to the real numbers for the current plan.

As far as somebody saying "current tax bill saved zero" being weird. Yea it is weird but not really an issue. Keeping the same plan won't save you anything, I would be more upset if it tried to suggest it did save you something.