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The recoil causes inertial pulling of the bullets. The light gun recoils so heavily that the bullet is jerked out of the case like in a hammer type bullet puller.

All guns do this to a certain extent that's the reason for crimping the bullet. The light weight snub nose guns just do it worse than most. I had a S&W Model 13 .357 magnum that would lock up if I didn't crimp my reloads hard enough.

Bullet jump is a real danger in lightweight revolvers shooting heavy bullets. In lightweight .357 Magnum J frame Smith and Wesson and Taurus revolvers bullets over 125 grains are not recommended. I won't carry or shoot 158 grain ammo in my .38 Taurus ultra light.