We just started Sprint 10 with our new board, but the Velocity report looks like this:

For Sprint 6 and 7 the Completed column is not correct, for Sprint 8 and 9 both the Commitment and the Completed column are incorrect.
We found some recommendations on the forum to close the sprint and start it again, that didn't help. Also it was recommended to revert changes like adding a new status. As it stopped working a while ago, we can't exactly tell what the changes were. So that doesn't help much either.
But as you can see, there are some changes in the Story point estimate field registered in the Burndown chart report, here in Sprint 9 for example:

It really seems there is something broken with this report.