A. Try restarting the app. This can often resolve minor display issues. If the problem persists, check for any available updates for the app in the App Store, as updates may include bug fixes.

B. If the issue continues, consider clearing the app's cache. Go to your iPhone's Settings > General > iPhone Storage, find Kana, and select 'Offload App'. This will free up storage used by the app while keeping its documents and data. Reinstall the app afterward.