cfqueryparam problem

The error template reports "The cause of this output exception was that: coldfusion.tagext.sql.QueryParamTag$InvalidDataException: Invalid data value 50 exceeds maxlength setting 2.."

The data comes a table where the field is longer than 2 but is trimmed before being assigned into an application variable and then put in a select-option element. On test system, foutputted len() of the variable and got 2.

The error happens on the real system but doesn't happen on the test system.

Hoping for permission to put same debug in real system.

What could cause this error?