why fr changes my data?

I have been using fr for 1 year and I have never had problems.

But now it happens a very strange event to me:

When it is executed the report changes the content to me of a field.

It happens single when the data of type string has a certain format.

Examples

1) string "( 1 - 10 )" changes to "( 10 - 1 )"
2) string " 1 - 10" change to 10 - 1

but when this string it has a letter/s works correctly

Exemples "value ( 1 to 10 )", or "value 1 to 10).

Explanation

- The value "( 1 - 10 )" its in a string field. It's not two values!!!
- The same app it's working in more than 100 clients and this "strange" happens single in one.
- I have tried different things, but any one work, it always interchanges the content, for example:
* VarString := str([CdsData."REFERENCEDATA"])


HELP ME PLEASE!!