And if output of your script is something downloadable, said space will "join" the byte stream user saves. So if you keep ?> and the space is after it then it will be sent. And outside PHP code block, white space is just being sent to the client.
But by placing ?> you tell PHP when your scripts ends. If you are in PHP code block, then white space does nothing. Your file starts with " PK" so unless you are not really need that, remove ?> from PHP script that produces your zip file (and I'd suggest removing this from all scripts) as there's one space somewhere which does what I described above, and most likely it lurks after ?> Some unzip managed to recover from this, others did not, so I suggest to open your ZIP file in any text editor and see if you got nothing like PHP Warning message in the beginning of the file. Without seeing your code and ZIP file nobody will tell for sure, but I recall having similar issue and it appeared my script was throwing some error messages which ended up in produced ZIP archive.
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