Never met it. 'Ill-' is sometimes used as a prefix to mean 'badly' - often when talking about appearancesand/or intentions: ill-dressed, ill-spoken, ill-attired, ill-mannered, ill-intentioned ... - often (always?) in contrast to a sort of appearance/<whatever> approved of by society, described with the prefix 'well-'. Some of these are archaic: a person described by Dickens as 'well-favoured' would be described today as 'good-looking'.
But I'd say 'badly put' (referring to choice of words), or 'misplaced'/'misaligned' (referring to position of actual objects). There are other 'mis-' words to do with spatial arrangements: for example, an arrow might be misdirected.
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