I ran also in same problem.
Buyer ordered a gig with one revision included, but now already we are at revision 4 and he still wants extra work done, although I already delivered him, what he ordered.
How oh earth is that even possible? Why does fiverr let the buyers bully the sellers?
Basically we fell in an endless revision loop, and there is no chance of getting out of it of the buyer always clicks on the "revision" button. I never get paid anymore.
Basically, if you are a buyer, you can get any work for free, if you are aware and always click on the revision button. AI generate some mumble description of whats still needed and let it go on endlessly till the seller gives up.