I did for a split second at a glance.



There are 2 reasons for it:



1. It looks segmented. When you look at the left hind leg, the upper and lower halves are blended together, so it looks like 1 thing, but the right hind leg has a line separating these halves, so the upper portion looks like a separate thing.



2. The coloring. The orange in the upper portion of the leg is noticeably bigger than it is in the lower portion, making that part an eye catcher, especially since there's much less of it in the lower portion, causing it to stick out less. The shading on it is also lighter than the shading for the lower portion, causing it to pop more while the other part blends in.



I guarantee you that if these things had been changed, you would not be getting this reaction.