Hi There and congrats on the Score!
We have seen a few interesting situations and scoring challenges. However, not anything as interesting as this.
We have seen people miss 4 and get similar Q48-49 result. While there was no confirmation of this, my theory is that the score and the number of questions right/wrong is a reflection of the question bank. If your question bank has mostly medium and easy questions, the number of mistakes drastically goes down. However, this seems to be a pretty extreme scenario. Did you feel the questions were on the easier side?
As to your question, I only know 1 instance of a score being changed (not the overall score but a sectional score - the sectional and total scores are calculated separately and using separate algorithms). The person did get their sectional score bumped to V51 (no mistakes) after initially getting V50
https://gmatclub.com/forum/q51-v50-253258.htmlP.S. Sorry it seems that since you are so new, you can't post attachments. Sorry about that - our anti-spam protection. You can email me the report and I will attach it.
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