I am the developer of Trackbook. I recently noticed that the version in F-Droid does not match the current version on GitHub. The F-Droid version is almost five weeks “behind”.
I am not sure if there is something wrong with current version of the app - or if it was a hick-up in the F-Droid build-system.
Please let me know if I can do anything. I really would like to stay on F-Droid.
Best regards & keep up the great work