Querying value with Question mark ?

Hi

I have a table with a column called POLISVNO where all the POLISVNO start with a question mark (?).

eg.

?412446355 1

?412709225 2

when I run the following query

select POLISVNO from AWD_ABC380 where POLISVNO like '?412%';

it returns zero rows.

also when I run select POLISVNO from AWD_ABC380 where POLISVNO like '%?%';

it returns no rows back.

I have created a test table in another database and inserted values these values in there and when I run the queries it actually returns the values.

The only thing I can think of is my NLS_CHARACTERSET???

The thing is, it worked in the past and now all of a sudden it doesn't work. No database changes like parameters have been made on this database?