Unfortunately this was caused by an error in the code. This has been fixed in version 2.5.2.
Please download it from the Database page.
Users who are using a previous version can import their data into the new version.
To update the Current Age of all birds (very important!), start the process by clicking the yellow notification in the lower left corner on the Bird Overview screen.
If that is not present (anymore), click Manage MBDB > Actions > Update Current Age for all Birds.
Follow the steps on screen and let the process run until it is completed.
Should you still experience issues, please contact me via gulls at vankleinwee.com.
Apologies for any inconvenience this may have caused.