React Native Environment Info:
System:
OS: Windows 10
CPU: x64 Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Memory: 12.50 GB / 31.92 GB
Binaries:
Yarn: 1.9.4 - C:\Program Files (x86)\Yarn\binyarn.CMD
npm: 5.6.0 - C:\Program Files\nodejsnpm.CMD
IDEs:
Android Studio: Version 3.1.0.0 AI-173.4819257
Describe your issue in detail. Include screenshots if needed. If this is a regression, let us know.

As you can see in this image, there seems to be double the bottom spacing. Or the app is not at 100% height.
This is only appearing on my phone: Xiaomi 8 on Android Orio 8.1
The spacing appears to be the same height as the menu down the bottom so it seems like it thinks the app is the full screen height.
This spacing is there when the app first loads (so on the splash screen as well.)
I think its to do with the hideable menu, as I have seen apps hide this menu, however I am not aware of how to do this.
This seems to be more of a device specific issue which I have not been able to reproduce on any emulators.
Xiaomi 8 Device
Update gradle and target sdk 馃槉
Had same issue on my own Mi8, it will look the same on all 18/9 screens
Thanks @LasseSLambertsen
Does this fix the issue after uprading ?
Any chance your could let me know what versions of gradle and sdk you are using ? 鉂わ笍
Thanks @LasseSLambertsen. Upgrading the targetSdkVersion to 26 fixed the issue.
@markhomoki Good to hear, was not sure which one did the magic 馃槄
@kevupton Sorry, for never answering, completely forgot about the issue 馃様
Most helpful comment
Thanks @LasseSLambertsen. Upgrading the targetSdkVersion to 26 fixed the issue.