Oddly I do, it doesn't stay in place as well as the other shoulder pad.
Hmmm well not much with my other figuarts, souchaku den-o and blade have loose armours, but that's because they're old, but yeah most of my main riders are fine.
The W figures are amazing, I don't mind that they lack figuarts articulation, the splitting gimmick is so much nicer, though still won't stop me getting the figuarts XD.
yeah the figuarts are like uber but I'm buying them for style, the WFC figures I'm buying for the gimmick which I absolutely adore.
My SH den-o is rather old and has met with the floor many times when it fell off my shelf, but it wasn't as loose as it was when I first got it. My kiva though is pretty much fine, and about yours having its arm pop out, that's certainly not normal D: