Buyer saying that he rated order but not showing on my gig.
You need to rate it back then only it will be shown
sahilsharma_bs is right.
Even if you don’t provide back review, the review will be shown on your gig 3 days later
Fiverr also sends blind anonymous review to buyers to rate sellers. That review goes only to fiverr and not shown on your profile.
So maybe your customer talking about that kindness of review.