New tag and site, but visits from 365+ days ago?

I have a fairly new site with a new piwik tag on it, and yet my “Days Since Last Visit” metric is showing visitors from 365+ days ago. I’ve attached a screenshot for verification. Has anyone else experienced a similar anomaly? Thoughts on how this could be occurring?

That’s surprising indeed. I dont know what could be causing this, appart from some user manually updating their piwik tracking cookies… surprising!

@apsharkey have you fix issue? I met too, my site is not enough 365 day, but in 365 show data.