The percentage in the "Issue Statistics" does not add up to 100% because it does not round.

[fbeaini]

The percentage values are shown as integers, but are calculated using truncate, which means the sum of the percentage values almost never add up to 100%. A value of "1.9xxxxxxx" is presented as 1% instead of 2% which would be a more correct value.

[Dan Breyen]

Hi, @fbeaini  welcome to the Community!  When I add the Issue Statistics Gadget to a dashboard, the percentages are over 100% which would tell me there is some rounding up going on.  I did find an issue entered for Atlassian to address the percentages JRASERVER-41108 . I would suggest voting for and watching that issue for further updates.   If you want to search in Atlassian's issues, you can find their site at jira.atlassian.com