What are my obligations concerning an administrative error in my university grades, and would my acquired degree and future salary be considered Haram?

We hope the questioner is not suffering from obsessive doubts (waswasa); the four grades might be the result of a single question. This does not invalidate the certificate, or make it unlawful to submit it to employers, or render the-salary haram. The questioner should strive to perform her permissible work as required, so as to deserve the wage.