Ace 2 countdown not working

[hallle0001]

Just got Ace 2 for both kids but daughter's countdown timer doesn't work.  if she sets timer for 1 minute it counts down never vibrates and restarts to 1 hr. The vibration works and alarms work but countdown doesn't. I've restarted device and checked everything else. If more a "99" appears grayed out/ in the background when a countdown timer is set for some reason.

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @hallle0001.

Thank you for sharing the details of the issue you’re experiencing. I appreciate trying to troubleshoot beforehand and recommend following the complete troubleshooting steps at Why didn't my Fitbit device alert me? Please also try the following:

1. Confirm the steps to restart the tracker: How do I restart my Fitbit device?
2. Change the clock face:  

• With your tracker nearby, from the Fitbit app dashboard, tap the account icon> Ace 2 tile.
• Tap Clock Faces > All Clocks.
• Browse the available clock faces. Tap a clock face to see a detailed view.
• Tap Select to add the clock face to Ace 2. Sync the tracker. 

Looking forward to hearing back from you.