Outdated WebView, insufficient RAM, or data conflict.
To run Facebook on Android 4.4.2 (KitKat), the best approach is to use the , which still provides active updates for older operating systems. While the standard Facebook app has largely moved to supporting Android 6.0 and above, specific "legacy" versions and the Lite alternative remain available for older hardware. Best Options for Android 4.4.2
Once logged in, tap the browser menu (three dots) and select "Add to Home screen." This creates an icon that works just like an app but uses almost no system resources.
If you want, I can:
Android 4.4.2 is no longer receiving security patches. Using Facebook on it exposes you to vulnerabilities that modern phones have fixed.