Question about the getting started tutorial

I'm currently working my way through the Logstash tutorial, but I've ran into something puzzling. In the "Parsing Logs with Logstash" section, I've gotten to the point where I am reading from Filebeat. I am reading correctly because there is output in the correct format and it contains data from the provided file. However, not every log from the file is being output. To be exact, every 8 entries are being output. I'm not sure what is causing this as there is nothing online that I have been able to find that explains why this is happening. Any help is much appreciated, thank you!