Pressure gets higher as you move right.
Notice how the ring between the primer and the rim gets narrower and shallower as you move right, indicating the primer is getting flatter. Notice, too, there is no cratering in the leftmost round. Second leftmost, slight cratering. By the rightmost round, the cratering mysteriously has vanished because the primer made a mandrel of the bolt face and smushed the cratering back into the primer. Not good.
In severe cases, the top of the primer will smash against the bolt, then flow sideways out of the primer pocket. When you extract that primer, it still will be wider at the top than at the base. In profile, it will look like a top hat, and that's what it's called. #4 above probably has some top hatting. It also is a load to run screaming from.
Some primers are "softer" than others and a little flattening and/or cratering is to be expected. With my .204 and the primers I'm using, I'd consider #2 from the left acceptable. Numbers 3&4, no. YMMV.
Also, some rifles also are more prone to cratering. My Savage .204 craters even with every factory load I've ever shot. It could be because of an overly large firing pin hole but I'm told it also could be because of an underpowered hammer spring.