Maybe you skipped right past the questions in Federal Review for the recovery rebate credit, which did indeed ask if you received the 3rd EIP. You were supposed to answer those questions correctly and enter whether you already received the $2800. Your mistake put $2800 on line 30 when line 30 should have been blank. The IRS knows that you already received the $2800, so they reduced your refund. You cannot get the same $2800 twice.
It was not a "bug." It was a user error.
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