Do the cartridges come completely out of the magazine?
Check the loading gate screw for tightness as well for protrusion into the action.
Remove the bolt in order to see into the action, then try and see what happens.
From what you describe, the carrier never gets a chance to lift the cartridge to the chamber, check
the next cartridge and see if it is not stopping before getting onto the carrier; it should not be on top
of the carrier but should be in the magazine stopped by the carrier. One cartridge should be fully on the
carrier clear of the magazine while the next cartridge is against the end of the carrier still in the magazine.
Your rifle should feed both of these cartridges. It should be an easy fix. (I hope)