You can enable him to change his feedback. Maybe he misunderstood the rating system and thought that "1" was high/good and "5" was low/poor, and he just doesn't want to admit that he misunderstood, so he's blaming "a bug."
@Carole S wrote:
. What do I do?
Go to the contract and click on "Enable the client to change feedback" and then tell the client to go to the contract at his end, ON A COMPUTER, not a phone or tablet, and click on the edit feedback link which will have appeared. He will then be able to change the feedback.
I complete a job with a 100% rating and after that, I again send a proposal to the current client he accepted and give me a new job and again a new contact started. I have completed that job with 5-star rating and with the best review. Now one client gives me two jobs and two reviews. But one of his reviews is showing publicly and the second one is not showing in my profile.
I hope it makes sense.
Please note that if the original job posting was posted by the client as visible to Upwork users only, it will not show in the visitor (logged out) version of the profile. This is working as designed.