I'm finding a trend in my wins that show up as losses. Everytime it tends to be a match with a disconnect, but I believe that it is actually me who is disconnecting from the match and as a result the game goes on without me; the opponent is given an easy win due to my absence, and so it shows as a loss. Basically, the stats don't match what I had, because in the end it was my opponents match stats that got sent to the server.
Of course, it could also be that there is some sort of desync and so neither myself nor my opponent disconnect, but we lose our connection to one another and at least one of the matches will go to the server.
I'm basing this on maps where I notice all of the other players drop, and the match stats are reported differently, thus indicating that it was likely myself that dropped.... hopefully that made sense. 