UnrealPak.exe - Error: PakEntry mismatch for ...

When using UnrealPak.exe I have run into an error when modding ReadyOrNot after the 1.0 release. The .pak files are not encrypted, but when extracting, some files will give this PakEntry mismatch error:

LogPakFile: Error: PakEntry mismatch for "ReadyOrNot/Plugins/SkinnedDecalComponent/Content/WoundDecal/WoundDecal_basecolor.uexp".

Is this because the .uexp file is encrypted? Or something else? I have scoured Google for anything on PakEntry mismatch and nothing has come up. Could someone point me in the right direction?

This is happening during the use of:

.../.../UnrealPak.exe .../.../some-file.pak -Extract .../.../your_output_folder