Sheridan, contact Beretta Support at their BerettaUSA.custhelp.com site describing this exact problem. I also provided them a link to a youtube video showing the problem happening. Though, I think they'll respond regardless. Give them the model, caliber, rifle serial# and detail description. They responded with sending out a new magazine that they said "fixed the problem" for both the one I got with the rifle and one I bought online from them afterward 2 years ago. I've cycled a number of cartridges through my A7 with these new magazines. The problem seems to have been fixed.
My understanding is that for some calibers of this model, the top metal rails of the mag were not turned inward quite enough in the originals. So, you should be able to get replacements, also, at no cost to you. Hope you get satisfaction, too.