did you have a qualified smith look at it? he may be able to help if that is its only flaw.
can't say for sure but knowing how rifles work, its possible the ejector pin is stuck.

when you work the action after firing, the sako claw extractor grips the groove in the casehead pulling it from the chamber, when it clears the ejection port, the ejector pin located on the opposite side of the bolt, pushes on the case at 90 degrees from where the extractor is holding it, causing the case eject straight out the side.

I see 2 possibilities, ejector pin stuck or a weak spring not causing enough pressure to bring the case out where its sposed to so the magazine spring is pushing the mag stack straight up deflecting the case upwards
or

the claw extractor is milled wrong causing the bottom edge to let loose allowing the combined pressure of the mag. spring and the ejector to push the case upwards.
let a smith look at it
RR