i noticed while the bike is warming up, i only see exaust coming out of the right pipe...
there's not much...but seems like nothing coming out of the left one

is this normal?
Your initial question was worded pretty badly. If no exhaust was being expelled from the left bank cylinders that would indeed be a problem.
If you want good answers you need to ask good questions. You see a little smoke out of one side and not the other but both sides are emmitting exhaust. Smoke (just a small amount) on one side...yes that would be quite normal since many things that can affect a bit of smoke (especially when cold) are not common to both sides......
Sometimes I soflty cover the the openings of all the pipes with my hands when I first crank it up to feel if the pressure is the same on both sides and if the temperature rises together