Sorted, I think.
I would seem that it's my mouse that is playing up. The option you get when pressing the wheel is occuring randomly without pressing the wheel.
Changed mouse and no problems, changed back and it happens randomly.
Nokia 8 vs Galaxy S8
Best new design books 2017: From vintage infographics to the the psychology of type
iMac 21.5-inch (2017) review
Nokia 8 : design, caractéristiques techniques, date de sortie