After copying a file from NTFS to HFS volume, file size changed when viewing in Windows

Hi guys,
I have a Mac Air running Mavericks on a HFS partition and Windows 7 on a BOOTCAMP NTFS partition. I have some files that I want to read/write from/to both systems. Since OS X can't write NTFS and Windows can't write HFS either, and I don't want to use any 3rd-party tools/drivers, I have to adopt a "stupid" way: in OS X, I copy those files from NTFS to its HFS partition, make changes, then switch to Windows and sync them back to NTFS.
The problem is, after I copied a file from NTFS to HFS in OS X, it seemed ok. But when I switched to Windows, the very copied file in HFS partition had its size changed (bigger) although I didn't make any changes to it in OS X yet. This happens to almost every file I copied, text and binary. For those text files, I tried to open it with EditPlus in Windows and EditPlus reports the correct size on the status bar.
How could this happen?

I am not sure if this is what your seeing but...
The same unaltered file on two different volumes might use different amounts of disk space. This is because a 'disk' is divided in to 'blocks' and a block (also historically known as a 'sector') is a certain minimum size. So if disk-1 has a block size of 512 bytes and disk-2 has a block size of 1024 bytes then a file containing just 10 bytes will use up twice as much space on disk-2 as disk-1 even though it is the exact same file.
Beyond that, Macs can add additional information like Spotlight tags, labels, icons, etc. which make a file bigger. If you are modifying a file then presumably that also implies adding additional content e.g. for a Word document more text and this will make it bigger. Also depending on some programs are configured or designed 'deleting' text may only mark it as deleted and not really delete. This can apply to older versions of Word which has a 'Fast Save' feature, new versions have removed this and do a proper delete.
You would have to give more details like what you are doing to the document, what kind of document, and what the two sizes are.
Finally, there is one other potential difference, some systems and manufacturers use 1024 as a unit for measuring file and disk sizes, some use 1000. It will be the same number of bytes in each case but 1000 bytes in one case would exactly equal 1MB, and in the other it would be 0.9765MB.

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