Hi Ken.
Nothing strange about it at all, most dulcimers made today have this fret pattern.
It's only 'old school' types like ourselves who insist on only having a single diatonic fret pattern('do' at the 3rd) rather than two diatonic fret patterns('do' at the 3rd AND 'do' at the open) that most folks use today.
That being said, having an instrument that only has the 'do' on the open string has definite disadvantages compared to one that only has 'do' on the 3rd fret. Choice of strings and having no leeway below the Ionian root being the main ones.
You could, of course, add a 6 fret, in the same way that old dulcimers have a 6+ added, to give you the style of dulcimer used by most people today