Issue in Keyword search using progressive operator

Not able to search the records in keyword search using progressive operator for few texts.

For Example we have title called “Out of the Closet” and when the same is used in keyword search with progressive operator, MDM DataMnager is not yielding any results though we have record with same title name in MSB_Title Field which is configured as stemmer field.

When we changed the operator to keyword contains in keyword search we are able to get the record.

We are using MDM 7.1 SP12

We did not find the issue when we were using MDM 7.1 SP04 and able to get the same record using progressive operator.

Attached the screenshots for the same.

Please let us know any information is required.