I received W2c from my employer, when I amend it says "We don't detect any differences between you original 2018 return and your amended return" but it is not true.

I received W2c from my employer, when I amend it says "We don't detect any differences between you original 2018 return and your amended return" but it is not true.

In the W2c, section 16 (state wages, tips and etc) is around $6k less than the original. why the software doesn't detect the change?