Start Sprint glitch in Sprint Capacity Planning & Tracking add-on?

[Steve Fogel]

We're using the Sprint Capacity Planning & Tracking add-on by Addon Experts Center. 

Seems like when you click the Start Sprint button in the Jira software on a day after the sprint start day, the add-on changes the number of days in the sprint and then recalculates everyone's capacity. Zat true?

We have our sprint planning meetings on day 1 of the sprint. Typically we keep making estimate adjustments and adding/removing issues to/from the sprint for the rest of the day and into day 2 of the sprint. 

Then when I click Start Sprint on day 2 or even day 3 of the sprint, the bar charts all change so that we're all over 100%, and it seems as if the reason is that the # of days in the sprint was recalculated to be fewer. Is this what's happening? If so, it's undesirable behavior. Should leave the # of days alone. 

To properly use this add-on, must I always click Start Sprint on day 1 of the sprint to avoid this? Thanks.