Why logged time during sprint is not shown in the Burndown chart

[Die Hu]

Hello community,

I have found that there are multiple tickets in my past sprint, devs logged time in the ticket using Tempo, I can see the logged time in the time tracking section in the ticket, and I can see the same number in the Tempo report. However when I go to the Burndown chart of that sprint, the Time spent is not displayed in the table. Why is that? And how can I make it work?

Note the not logged ticket is added to the sprint after the sprint started, Idk if this is the reason.