The spelling of the word "bandier" may seem puzzling at first, but it follows the common pronunciation rule of "ie" pronounced as "ee" in English. In the IPA (International Phonetic Alphabet), the word is transcribed as /ˈbændɪər/ with the stressed syllable being "band" and the "i" representing the "ee" sound. "Bandier" is another term for "more bandy" or having a bow-legged appearance. Despite its obscurity, the spelling of "bandier" aligns well with English pronunciation patterns.
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Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.