Wheel hub question w/ pic
 

Had the truck for a few weeks now (love it) and while I checked everything out I could remembered to check before purchase (despite my resounding lack of vehicle knowledge), I completely forgot to check under the hub cap and of course, it raises questions.


Center of the rim, wheel hub difference.

Picture 2 (fronts) I assume is normal for the h3, picture 1 (rears) I guess not so much. Why is it different? The little pink x on it looks ominous too...

Thanks in advance for answers!