If you have the Owner's Manual, that used to tell you how to remove the ejectors for detailed cleaning. Oiling them can just make the problem worse if there is gunk in the ejector slots. Remove the ejectors, clean them and the slots they ride in, then lube and re-assemble and the problem should go away.
Unfortunately, I don't remember exactly how those ejectors come out. I know they don't just "snap in / snap out" like I think they do on the new Gen III Red Label and the so-called "Brescia Action" guns like those made by F.A.I.R. or built like them, as the Yildiz SPZ ME / Legacy HP guns.
If you don't have the Owner's Manual, I think that Ruger could at least supply you with another one.
You could just have an "ammo problem." The old gen-one Red Label I had would fail to eject the top barrel when shooting that super-shitty Winchester "Universal" ammo sold at Walmart and other big-box retailers; nearly as bad with the old and near equally crappy Remington "Gun Club" shells. With Winchester AA, or other quality ammo, the issue magically disappeared.
Another issue that can cause misfire and ejection problems in the original Red Label is stock bolt interference with the inertia block. The least invasive way to solve that problem is to take the stock bolt out, slide a washer down it until it contacts the bolt head, and re-install.
