Take the word “wind”, for example. Its original pronunciation rhymed with “lined” and “mind” in every case; today, the word designating “air in motion” has a shortened “i”. This apparently occurred in the 18th century.
The word which still has a long “i” comes from an entirely different root: the Old English windan, meaning "to turn, twist, plait, curl, brandish, swing”. This wind is related to “wend” and to “wander”.
Source: Online Etymology Dictionary