Reminds of a funny story. Back when I was reviewing the contract for my current job, I noticed the HR lady confused my yearly salary with monthly. That meant they were going to pay me almost $100k per month if that contract was signed!
I pointed out the mistake three times and she insisted the contract was correct. I had to contact a company director to get it corrected.
You still get that 1 paycheck which would be the size of yearly salary, especially if you can prove you made effort to confirm the amount prior to signing.