Too few tweets returned

Hi everyone

I have a slight issue with the script. It seems to return too few tweets when I run it. For example, if I run the following code from the terminal:

~/Desktop/GetOldTweets-python-master$ python Exporter.py --querysearch "refugees" --maxtweets 5000

I would expect to get the maximum amount, since the topic should generate at least 5000 tweets. However, the output file only has 2605 different tweets. Does anyone have an explanation for this problem?

Thanks in advance.