Sync devices does not work under iOS 8.
Some tasks get dropped and some are multiplied.
When do you plan to fix it?
When the Sync does not "work" under iOS 8, you will need to reboot both devices. There is some sort of Bonjour bug in iOS 8 that is being reported by many other developers that have apps that sync between devices. The reboot seems to fix that.
Duplicates are being caused by the "Saved State" issue. What happens is that when you relaunch TM after it had been sleeping for awhile, it will bring up the Time Entry "Edit" screen with a *copy* of the last entry. If you tap Save, it will duplicate the previous entry. We recommend that you tap on "Cancel" if you know that you had Saved previous (e.g. unless you were interrupted by a phone call). We are not aware of any "lost" entries. Only duplicates. The "saved state" issue has been fixed in TM v6.0.5, but Apple is really slow right now for "Reviews" and we believe it may be at least a week before the Review it and put it up on the App Store.
If you want, you can email us the Backup files from Both devices and we can try and take a look at your data. Please let us know what entries you think got "deleted"?
This is very dangerous especially that Time Master Central does not work with iOS 8 either (so no restore).
When will you fix Time Master Central?
No, we stopped supporting TMC back in 2011. Only about 1/2 of Windows users were able to get TMC to work and we moved to Dropbox at that point. Dropbox works great on all platforms (iOS, Android and Windows

. That is what we are supporting now and recommend that you use Dropbox. Setup -> Database -> Online Backup & Restore.
Cheers,
Adam.