PreludeBC420

hey everyone reading this, I have a 2000 lude which I recently replaced the ball joint in upper front as they were getting sloppy... I didn't press them out as some say you need to. I've also heard I these forums and others that you must replace whole upper control arm, well that's not true either, but I don't have a shop press and wasn't willing to pay a shop 100$ to press out and in me new ball joints I already purchased awhile back. Anyhow what I did was hammer out old , and hammer in new, made sure they went in 100% straight, with no issues, but after driving a few hundred km (I'm Canadian) I visually inspected both and the passenger side ball joint has somehow come up about a mm in the control arm, has this ever happened to anyone? Why would it do this? I tack welded it in hopes that would just hold it in place but that broke free too.

PreludeBC420

And yes everything was properly torqued to spec. As that's the first thing I thought is maybe the castle nut was not properly torqued, it is and is pinned too.