Slugs Tumbling

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Have any of you experience slugs tumbling backwards while loaded in FX Impact high capacity magazine and if so how can this be corrected?I apologize if this topic has been brought up before.
 
Wow I did not know the slugs were so short so they can tumble , I guess you can make a shim but it would have to match holes perfect or B if you can cut a groove on the top id and put a thin oring where it makes enough drag to hold them short slugs ,

Me I usually have other problems I like heavy ammo and alot of slugs wont fit in mags so you have to single load them .