I don't know what level game you were watching, but it's not unusual for an umpire to find that an amateur field has been mismarked---including the batting boxes.
Depending on the location and degree of variance with such mismarked fields, umpires should address the situation at pregame and cover under ground rules. At times, that may mean rubbing out the lines of a mismarked batting box.
Just my opinion,
Freix
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