Your Feets Too Big

I have noticed that my toes rub inside the sneakers I wear to the gym.  I haven't noticed this with any of my other footwear, so I thought maybe I bought these a half size smaller because they were on sale.  I checked inside the sneaker, though, and it says it's my correct size.

Did the sneakers shrink?  Does that brand run small?  Are my feet growing?  (My mom said this happened to her as she aged, but my dad never mentioned it.)  Maybe this is just another way that I'm abnormal.