Yep same here when I view the forum on a work PC, sometimes it selects random button combinations, font size, strikethrough, underline.... all very random
I've learnt how to deal with that - just be aware of where the cursor is as you click on reply - its feckin annoying because once italics or underline or bold id on you can't get it off without starting a complete new reply - I am glad someone else has had these issues is not just my speshullness