File name in offline dlt logs changes from mainlog_10 to mainlog_256 inspite of mainlog_11

I am using dlt-daemon 2.18.10 version.
Sometimes, when new file is created in offline dlt logs, the file name changes from mainlog_10 to directly mainlog_256 inspite of mainlog_11.
I am using default dlt configuration, and offline file name filter as mainlog_

I am not modifying filename counter too!!!
and the below lines are commented in dlt.conf file.
Wrap around value for log file count in file name (Default: UINT_MAX)
#OfflineLogstorageMaxCounter = 999