My guess would be a Y belt slip. (Bit a little duller after all the carves and so harder on the belt.) Try retightening the belt.
Since it continued to track correct after it moved over.... I would say some dust in the encoder....
WAG.... Wild AL Guess...
AL
Favorite Saying.... "It's ALL About the Brass Roller"..... And "Use MASKING TAPE" for board skipping in the X or breaking bits.
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