Last release of KyPass for macOS has been rejected by Apple.
This version had to fix the bug with macOS version before Mojave but the App Store Review team think that a bug is still present.
In the meantime, you can:
- Use the beta version that fix the bug at https://www.kyuran.be/beta/
- Do a rollback from your TimeMachine backup
- Upgrade to Mojave 😉
To avoid that in the future, we search for beta-testers. PM me on the forum if you want to improve KyPass.
If you don’t want to be beta-tester, you could send your suggestion too on the suggestions sub-forum