The most likely answer is that your ePub doesn't have an embedded font. ADE's default glyph set is very narrow and only really suitable for books in English.
If you can edit the ePub, then you can embed a font yourself. Or alternatively you could load kartu's PRS+ firmware into your 950 (see the Sony Dev sub-forum on this board), which allows you to upload a default font of your choice to the reader.
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