There are a few answers to this. The most common reason why you didn't receive as many photos as you were expecting is that it's highly likely you had a number of 'blank' frames on your roll. We will usually let you know in your scans email, of any imperfections or issues with your roll (such as heavy scratches, light leaks and blank frames etc.). Even without blank frames in the middle of your roll it's also quite common that, although you think you have a 24 or 36 exp. roll of film, that depending on the camera you're using and/or how you've loaded it, that you may not always get exactly that amount of frames. There are several reasons why this might happen, including potential issues with your camera, but if you're still not sure feel free to get in touch with us and we can double-check for you. hello@jackslab.co