Quick question about ball joint?

So I just put in both lower ball joints, had them pressed into the plate that the orignal ones came in. I have drop spindles so they are not stock ball joints. So anyways I was jacking up Lca getting ready to place upper bag plate and noticed ball joint fell out of it's plate.... The other side which is all done is fine. When I put my spindle on I hand tightend the nut as much as could and lowered it to the ground to cut out more out of the inner fender then went to placeing the top plate. Should have I fully tightend the nut or did they do a shitty job putting it in? It looked like it had a little gresse around ball joint, maybe this made it slip out? Right now they are faceing up and ball joint is pressed in from bottom up. Should I flip them so the weight is on the top pushing the ball joint on the plate? Kind of nervous about other side once I get this thing on the road don't want it to fall out.

thanks.

Once the bags are in, they will push down on the control arm, while the weight of the truck will be on the wheel itself, and ti will keep the balljoint in place.