The 20 round Reising magazines are still single stacked, compare your magazines with 20 round Thompson double stacked magazines. Your magazines look a lot like the US M3 single stacked magazines. Dougble stacked magazines
are suppose to feed better and not as difficult to reload by hand.
Actually, the 20 round Reising magazine is double stacked but feeds like a single stack magazine while the Thompson 20 round magazine feeds from either the left or
right side as a true double stack magazine
