Tammi,
I have three theories:
A: The little three fingered spring that holds the cams in is either week or the wrong one. It holds the black cams fine, but not the white cams.
B: There is something causing too much pressure on the follower that works with the cam release lever. So it causes it to shift around as the top follower rides the cam and then pop out.
C: There is something binding in the cam release, rear follower parts. Sometimes the cam release lever works easily, sometimes it binds and won't go all the way to the rear.
I'm working on something else now, I'll have to get back to it later.
I might take it to my LSMG, I'm sure he needs a laugh.
Joe