Is that bracelet fully attached to the bottom set of lugs? That's a huge gap... I haven't mounted my M22 on the tungsten bracelet is quite some time, but I'm almost positive it was a tighter fit than that.
The bracelet is NOT securely attached like this. Smaller or larger wrist size shouldn't matter.
Again, I would strongly recommend that you really get in there and check, make absolutely sure that the ends of the spring bar are actually extended into the proper lug holes.
There should be no arch in your spring bar. I can see the bent tips on the spring bars in your photo of the caseback. It won't be long before that fails.I understand the apprehension and it could potentially be problematic.
However, I just examined the gap more closely. The mounted springbar is arched to the same degree as the watchcase. It is securely attached nonetheless. I applied considerable force in every direction and the bracelet doesn't come off. For me, it's a minor cosmetic deviation, and am confident the watch won't fall apart.