Help Needed ASAP

Hello, I need help asap because I have a competition tomorrow morning. I have a light sensor and when nothing is over it the analog value is about 110. When something crosses over it the reading jumps to about 1020. I got my Arduino set up today and the value was 1021-1022 and when something crosses over it the value stays at 1022. I have no idea why and I will have only 30min tomorrow to fix it. I have checked all the wires and they seem to be in place. And all the other sensors are working one of which is an identical sensor. Any suggestions you have for me would be greatly appreciated. Also the program did not change and the lighting seems to about the same as my room.

Link to sensor

Probably too late but:
Have you tried to switch the 2 identical sensors? to check if one is broken?