Thread: 5 round tikka mag feeding issue

So I bought a second hand 5 round (4 for the 7mmSaum) tikka mag and it's not feeding the last two cartridges very well. It's like there's not enough tension on the spring and the primer end is sagging with the bullet pointing high. Is this a common problem and is there any easy fix before I go through the painful process of trying to get my money back? Cheers