Did you mean .vmf file?
HammUEr has no support for compiled bsp files.
I don't have access to my code archive at the moment, so I can't really check with an actual 4.15 build, but my guess is it's got something to do with the displacements?
(Also, this is a decompile, and decompiles are technically not supported. Maybe try opening it in HammUEr and saving it back to clean up whatever the decompiler did?)