Sorry no idea, but fortunately it doesn't sound like a major prob ;-)
On a more general note, since you're both using KM "shared", are you aware you can create multiple KM profiles, each with own settings? But you'd have to tell it at browser start with which profile to start, or to use different shortcuts to start, unless you also use different windows user accounts. So not much won for this tiny prob above, but perhaps it may come in handy some day for more important stuff