It's VERY common for Rossi's to have the leaf spring for the cartridge stop installed incorrectly. It's like there was a period where they had an assembly worker that either didn't know how to do it right, or didn't care.
Watch my three videos I linked above on YouTube, it's a pretty simple fix.
You should also replace the ejector spring with one of these. The stock spring is far too stiff and will eventually cause the ejector to stress crack and break. Details are on the label, I got mine on eBay, under $10 shipped for a pkg of six. A GREAT upgrade! And the cases don't fly 15 feet anymore either.