i had the same problem and also gave a bug report : +3 -1 -5
Points Halved!

I thought it was only like that in ultrabullet (in less than 1 min, I only lose 4 points for losing against an 800)

Thanks. We are going to fix this within 24 hours. Meanwhile, you will also lose half as much, so that's nice

If this is only on beta then the good news is:
If I'm winning, then I leave Beta, refresh, and get the 8 points. if I'm losing, I stay in beta and lose 4 points
So after the Server Restart today.. the points were halved for some reason.... and if it was done knowingly... please reverse this!