[Inkscape-user] SVG font feature

I am trying to collect an number of characters to generate a font file (for oracle bone script).

I am importing (inkscape) SVG files into inkscape to assign the path to a particular character. My characters are usually 700 x 1000 inkscape units large. In the Preview Text some are the right size, some are substantially smaller than expected, looking more like a superscript.

The characters in the attached screenshot are all the same size on the inkscape page.

Is this a problem with the preview feature, or a problem with the SVG font feature?

Thank you for any help. Severin