Upcoming Weblate 3.3 will bring new feature called alerts. This is one place location where you will see problems in your translations. Right now it mostly covers Weblate integration issues, but it will be extended in the future for deeper translation wide diagnostics.
This will help users to better integrate Weblate into the development process giving integration hints or highlighting problems Weblate has found in the translation. It will identify typical problems like not merged git repositories, parse errors in files or duplicate translation files. You can read more on this feature in the Weblate documentation.
You can enjoy this feature on Hosted Weblate right now, it will be part of upcoming 3.3 release.