
Yes, but there is probably no way to fix that as it is not possible to manually set the okurigana at present.
I'm adding it to the list
[@moderator] Sentences with the wrong reading for kanji

And it's beteer to be chaged to:
ひと月に一度
or
月に一度

Better as in "This is a way to avoid a wrong okurigana", or as in "This is how a native would write it anyway.?

Both.
We write and say:
ひと月に一度, ひと月に一回, 月に一度, 月に一回, 一ヶ月に一度,
一ヶ月に一回, 毎月一度, 毎月一回
And I think that 一月 is not wrong also, but when we saw 一月, we imagine January first of all.
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We cannot determine yet whether this sentence was initially derived from translation or not.
linked by an unknown member, Datum nich kennt
linked by an unknown member, Datum nich kennt
added by an unknown member, Datum nich kennt
linked by xtofu80, 2010 M06 12
linked by zipangu, 2010 M06 13
edited by blay_paul, 2010 M06 13