Why in my jmeter.log file all records are put in one string?

Here is an extract from jmeter.properties :

# Default format:
#log_format=%{time:yyyy/MM/dd HH:mm:ss} %5.5{priority} - %{category}: %{message} %{throwable}
# \n is automatically added to the end of the string

So, every record must be on a new line... Maybe there are properties somewhere where I need to change something?

Give an advice please, because reading my jmeter.log file is embarrassing