I started working for a company from 10/2018. When I enter the W-2 information the website automatically says I also got income from the company in 2017 which is wrong.

Where does it say that?  It wouldn't make any difference to your 2018 return if you got 2017 income from this company or not.

I think it is a website bug. The Wages & Income page is listing my 2017 and 2018 income so that I can compare however it is getting wrong. As you said 2017 does not make differences for 2018 so it does not matter for my actual report.

It doesn't compare W-2s from the same employer, it compares just plain W-2 income.

I don't know what is going on as I did not work for this company in 2017. As I said I only started to work from 10/2018.