Automation not working properly

Hi everyone,
I have Cubase 8. 0.35 on PC Windows7 64bit sp1 and for some strage reason the automation behaves erratically. sometimes I tried to record volume or changes in the plugins and I can see it recording the curve or value but then it dissapears, also in volume automation it does not record the movements exactly as I preform it on the fader, it does more like a linear value of waht I did. has anyone had this problem or issue before?

Thanks for your help.