Because in your site and others like resonance, a common answer key has been uploaded per shift
Hello Abhinav
JEE Main 2019 exam was conducted in eight shifts and the question paper was different in each shift.
Also, questions might not be in the same order for the same shift candidates but the paper was similar. That is why there is common answer key. Eight answer keys has been uploaded, one for each session.
You can go htrough the link below and check the answer key
https://engineering.careers360.com/articles/jee-main-answer-key
Good Luck!
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