no idea what you are describing. if the notches are in place, you shouldn't be able to pull ram out without some extreme force.
But here is the problem, I seated the ram correctly, and I tried to push the ram in. I remember back then when I installed ram I usually hear a click then put the notches back and it won't come off even when I pull it. But now, I tried and tried, but everytime I put the notches together I can still pull the ram out.