Has anyone had problems with Walgreen's one hour photo?

OK, so I'm learning how to play with my Holga. I have modded it it use 35mm film. The first roll I know I messed up on, it was over exposed thus it was blank. However, I have read up and thought I covered my bases. I've been very careful to load and unload film in complete dark, I've made sure to tape any place I might be getting light leeks, I've been sure to tape the end of my film securely and centered on the left hand spool, ect. I found that when I ran my film down to Walgreen's for One Hour photo, they cropped the sprockets from my photo's and out of 24 exposures I only received about 6. I realize Walgreen's isn't necessarily the ideal place to get my film developed but 'm not sure if I'm just missing something or if the problem actually lies with Walgreen's.