Steam Manchester Commuter: 'missing' Services Airport - Alderely Edge

This is a weird one and I haven't seen it reported so it could just be isolated to my machine. I have an 'issue' where ALL the Airport - Alderley Edge services cannot be seen in the timetable BUT if you move the mouse pointer into the gap between the services they reveal (Note the text in the right side box)

Normal View:


Mouse pointer in the gap beween services: