I got 2 rolls of film developed at 2 different places. the shots that i wanted the most didnt develope. one place gave me a index of the prints, it had 3 prints that i wanted with X's over them. (waterfall) this roll was B&W the other place i got 32 of 36 pictures. This roll was color.(missing same waterfall) why does this happen? they were taken with long shutter exposure times, the other were normal speed.