The reasons for the abnormal recovery of this situation include unreasonable fixture design, insufficient skills of operators or improper operation.

1. Unreasonable fixture design: The characteristics of the material were not taken into account when designing the fixture, which led to the fixture's failure to locate the material accurately and quickly, resulting in material damage.

2. The operator's lack of skills or improper operation: when using the fixture, the operator did not follow the standard process, resulting in the fixture not working normally, thus causing material damage.