Couple thoughts. When inserting the magazine do the rear first. You should hear a click when the tab at the back passes over the catch lip and then a second when the front clip grabs.
With the magazine empty and lying on a table try pushing the follower straight down using a pair of pencils or a strip of thin wood. You want to make sure it travels smoothly down and back up. Sometimes the follower (any magazine brand) can get tipped off the spring(s) inside and pushing it down to the bottoming out level realigns the springs.
But if it turns out something is keeping the magazine from fully seating at the back you may have to find out what is stopping it.Take the bolt out and watch the magazine from above as you insert it.
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