State timeline visualisation, dataset names and graph not aligned

Hi !

I tried to visualise the state of some switches (0,1 - ON-OFF).
Have 8 “channels”, visualisation looks good, but channels nam on the left is not correctly aligned, as you can see on screenshot. Does not help if I resize the window. I see the 8 channels but name list on left only showing seven.
Any idea, what I am doing wrong ?