Consistency in daily athlete score

Hi,

I have found topics that seem similar but they don’t answer my question and are closed. So I dare ask my question in a new topic.

I have a Current Streak of 66 days, 67 days ago only my planned training was logged but seven minutes of my usual stuff were not (the debate about that is elsewhere), before that I had a Streak of 299 days. So out of 366 days (including today) I hit base and performed all my planned training sessions in 365 days. To me this would means that my consistency is 365/366 * 100% = 99.7%. Why does my Consistency stand at 98%?

Best wishes,

Uwe