DIff false positive

[Jorel Anthor]

I'm having some issue with a false positive diff showing in bitbucket after making a PR;

Situation : 

I added a new file to our codebase that didnt exist before. I copy pasted this file in various folder, where the file was missing as well.

Expectation : 
The whole file should be considered new, and highlighted properly to inidicate that every line, is new to the codebase.
No change delta should exist.

Reality:
The whole file isn't marked as new.
There seems to be stuff that have been deleted, which is nonsensical in the scope of a new file.

Is there something that i am missing ? We're having similar shenanigans with bitbucket recently, that should probably be its own post so i wont discuss it further