possible ribbon bug - gun master mode, finish top 5 ribbon not awarded???

Hi,

I finished in 4th place last night while playing gunmaster mode and have just realized that I was not awarded the top 5 ribbon.  I know this is not a major thing, however I thought I would inform.

The battle report for the match can be found here >> http://battlelog.battlefield.com/bf3/premium/#!/bf3/battlereport/show/78288505/4/208049548/

One possible explaination is that you have to be in the top five and be on the winning side perhaps?  If this can be cleared up for me, that would be appreciated.

Cheers