I'm having this issue too. It's extremely frustrating. Mine don't turn sideways, but they do get stuck at the hole and won't vibrate down. They get really stuck, nothing short of opening it up with get them unstuck. It has occasions when it works well for 20 - 25 primers, but i get atleast 5 stuck per tube fill. If anyone knows a fix that won't make the primers flip sideways, i'm all ears.