No problems here at the front of the rivet. Click to expand:
And the buck-tail here on the other side looks good:
Here’s your problem: the end of your buck-tail looks like an aluminum can because it’s made out of aluminum. It’s one thing to have a defect in your MG18A03C AN 36009 CA 00213 Straight Leg Egyptian cotton (or cotton from Egypt, anyway) jeans, but it’s another thing to look like they’re not even trying.
Construction seems a little cheesy at 20x life size.
How to fix a rivet – that’s the next task…