something is dreadfully wrong or we are missing some info here; Content Browser only re-wraps upon import to FCP. it has no idea how to transcode during this process so even if it lost its mind it's next to impossible that this would be the result.
that said, i can make a few recommendations:
1) use Content Browser 2.0.1 and make sure FCPX is @ 10.0.8.
2) use the free Camera Import plugin for X...this does the same thing as CB (places a QT wrapper around the file, leaving it in its native codec) but natively within FCP X