store window - might be because really slows down load time of page for dialup users.
right click - some people like to navigate around by right clicking, if pic doesnt load right click on it and tell browser to retry to load that pic, etc.
so could be someone wanting to help ya, could be someone who's frustrated by it, or could be someone wanting to copy your pics and get you to stop cross-promoting your stuff. could be any of those.