Velocity chart - empty completed column

[Leonard Pooch]

Hi, I'm currently evaluating Jira in order to switch from our previous project management tool. But, for now, I'm encountering a problem that is blocking us from adopting Jira.

The fact is that all of my "Completed" columns from all Velocity Charts for all of our projects are empty while the "Commitment" colums appears pretty accurate.

Here is how i came to this result :

•  Exporting data to CSV from our currently used tool
•  Preparing data with Google Spreadsheets
•  Configuring Jira to reflect the config of our currently used tool
• Importing data to Jira using the Jira import wizard, correctly mapping all data
• Using a script to import all attachments
• Using another script to recreate all my sprints :
  • Collecting all sprints from the previous tool
  • Collecting all infos about those sprints
  • Creating all sprints (with name, board id and goal) using Jira rest agile api
  • Collecting, from the previous tool, all issues that where assigned to sprints
  • Collecting all infos about those issues
  • Assigning issues to sprints using Jira rest agile api
  • Editing all sprints infos (status, dates) using Jira rest agile api

I've try several things (related to changegroup / changeitem, issues statuses / workflows, dates, events / events parameters, custom values / custom fields, histories) but none of them actually improve the situation.

This problem appears only with old sprints, if I do the same things with current or future sprints, it seems to work as expected.

Can someone help me figure out the problem and how to solve it ?

Thanks, Leonard