PHOTOSHOP ILLITERATE!!!!

Ok..so I finally hit a milestone in figuring out how to do stripes on photoshop and I am ecstatic! Then I figured out how to make them lighter and darker...GO ME!! Well, here is the problem... if the picture is any larger it will go behind the last two stripes as well as the writing..which is weird!! UH..WHY is it doing this??? If you know, PLEASE let me know! By the way I tried to download it to here and it wouldn't do it so if you know how to do that to let me know.