I do have a hunch as to how this issue arose:… it's spelled exactly like they spell it on all of there product information/website. The only place they show the macron is in the Logo.
I'm willing to bet that with the exception of the graphic artist that created the logo, no one could figure out how to use the "I-macron" in text form in either their product information or the web site! (Said Tom, adjusting his wizard hat.) {smile}
(Although that is clearly not a true "Tom Swifty".)