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Because English spelling rules are stupid.
Actually 'one' should be pronounced the same as 'own' using the normal spelling rules of English.
If you re-arrange the letters of 'own' you can get 'won', right?
Word History: Why do we pronounce one (wn) and once (wns) while other words derived from one, like only, alone, and atone, are pronounced with a long o? Over time, stressed vowels commonly become diphthongs, as when Latin bona became buona in Italian and buena in Spanish. A similar diphthongization of one and once began in the late Middle Ages in the west of England and in Wales and is first recorded around 1400. The vowel sound underwent a series of changes, such that the word's pronunciation went from (n) to (n), with two syllables, to (wn) to (wn) to (wn) and finally to (wn). In southwest England, this diphthongization happened to other words beginning with the long o sound, such as oats, pronounced there now as (wts). Only in one and once did this diphthongal pronunciation gain widespread usage.
Can you read?
How words should be spelled using normal English spelling rules:one/won - wunhave - havtwo - tooEnglish - InglishWall - WahlLight - LiteHeight - HiteWeight - WaytFloor - FlawSure - ShawMe - MeeI - Ie/Y/AiYou - YooWe - Wee
English has a lot of exceptions to it's normal spelling rules.