Well. It seems Fiverr has not penalized my gig, after all. My percent cancelation was adjusted a few days ago.
I'm not sure what happened.
This incident has made me edit my gig, though. I have now doubled the cost of my gig, and I put in the description that repeat customers can receive 50% off.
So, this is just to incentivize repeat customers. Also, it's easier for me to run the gig for someone a second time (just how the process is set up) than to start from scratch with a new customer. So the increase in price and also the discount makes sense that way, too.
I don't make a lot of money on Fiverr. This is just a thing I'm doing on the side to see what might happen. You can tell my gig is not a scam. I have 4 5-star reviews so far. It is being well received.