dlt-receive inconsistency between console payload and output file

We have a pc where we run automated tests for a device where we use dlt-receive to print the DLT logs in a console while also saving them in a DLT file. The console output is also saved in a separate '.log' file with an internal app we developed. When trying to analyze some logs, we have noticed that while the logs are available in the console's output (our '.log' file), logs can not be found in the DLT file for quite some minutes.

In more detail, we have a script that runs this command and adds an event handler to capture and save every log line printed in the console in our own '.log' file.
The command is similar to 'dlt-receive.exe -a -o .\log.dlt -c 200M -p 3490 192.168.0.2' (we build the .exe with cygwin)
This command will of course also save the logs as a '.dlt' file. But apparently, lines are missing from the '.dlt' compared to '.log' for ~30 mins