RMSDK did not honor a width centered back when I got my Astak.
There was nothing wrong with the books code as it looked fine on Calibre, Sigil.
It was just one of the known quirks.
Kobo (KEpub on my Aura2 and Libra2) incorrectly applies letter spacing to a space (or NBSP) and runs words together (Velum uses that in Chapter heads). I have a saved search to comment out any found in the CSS
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