So, I’m out of time, and still confused. I went to this page: http://500px.com/shikhei , it shows the big photo at the top. Caution, snakes and bugs, but great photos. Anyway, if I click on the first snake, at the top, there is a set of thumbnails, and beside the photo, there are left and right arrows. Navigation seems good. I don’t see any unexpected photos popping up. If I go to your page, I have a similar experience, and I can manoeuvre without difficulty.
The only time I see photos from different people is when I start from Popular, or a similar aggregation. Then if I want to follow a particular person, I have to click their avatar to get to their page before moving through their photos.