You may not be pushing your pins in far enough or it could be the pins used. I haven't had any fall off and I crammed a quilt basted with over 200 of them in a bag and not one fell off. My sew group was very impressed about that. The long thin very sharp glass head pins slide in easy and stay in. The larger size pins, the silicone doesn't seem to self heal around them as tight. I use to use whatever pin I had but soon learned which ones worked the best. Of course it was the expensive pins!