the left side is the stator cover, the clutch actuator goes in that side and psses thru via a rod/ball/rod deal, to the clutch on the other side
some factory trans oils are reddish, if it's not smokin bad smelly smoke, clutch side crank seal is fine, it would be the other side anyway
the stator side crankseal can leak into the cover, but that would be fuel/oil mix from the crankcase, not trans fluid
and your seeing the oil go down in the sight glass, is pointing to a trans leak somewhere, i'd give the vent tube and the drain plug a good look
it's possible the drain plug is leaking and just running under/across the bottom of the motor and looks like it's coming from the stator cover < my sons bike is doing this exact thing right now due to a stripped drain plug, try'd a rubber gasket, and copper permatex, still leaking, time for me to go to the lt250r 14mm drain plug and re-tap the hole