Piwik 1.10.1 bug returning visitor count

Hey I have generated January month report and in Returning visitor section is show 0 (zero) Unique returning visitor, That is not true… How do i check correct value in web interface? I didn’t find any thing about Unique returning vistor info on web interface. I can see Unique visitor but not Unique returining.

I have notice “Ignore visits with X-Do-Not-Track or DNT header is Inactive” does that matter?

Please let me know if this is a bug in new release, so atleast i can downgrade my version back to older.