Tag Historian - Rate issue

I'm on 8.1.22

Not sure if I missed something, I try to set history on a tag with a sample rate of 1 minutes. I use Power chart to display the history and export data to csv file, in my file i see that tag value is insert every 2sec.

I Also tried by used tag group and got same issue

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The observed rate from a query will not be the same as the actual sample rate unless you're using 'Natural' aggregation mode in your history query. What does your history query/binding/etc look like?

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I use PowerChart, it don't requier any binding to access data

Try setting the aggregate mode to LastValue? And/or try changing the point count property to -1.