Log file as root user?

[eluser]Unknown[/eluser]
When I upload file thru CI, file user is set correctly as www-data:www-data but for some reason log files what CI creates automatically are as user root:root.

Don't know if that's the problem but my log files are full of text:

Code:

Severity: Warning  --> chmod(): Operation not permitted /mypath/public_html/system/libraries/Log.php 106

I believe that there is chmod update on log class just in case when text is added to log files.

Any ideas how I should fix this problem?