Photoelectric Effect Experiment

1. The problem statement, all variables and given/known data

Hello. Currently I am doing an experiment of photoelectric effect. There's one part that ask me to show that the maximum kinetic energy(or stopping potential) is independent of intensity of light. But from my data, i found that the stopping potential do decrease with decrease in intensity of light. Is there any explanation of this effect?

2. Relevant equations
eV=hf+[tex]\Phi[/tex]
(from quantum view, only frequency will affect the stopping potential)

3. The attempt at a solution
At first i thought of maybe is due to the time delay, but i not sure how to explain it as in my lab manual it didn't mentioned about time. Here is my lab manual as references.
http://www.physics.nus.edu.sg/~L1000/PC1144/PhotoelectricEffect.pdf" [Broken]
 
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