When you modify an attribute value, do not unintentionally include trailing spaces at the end of the value. Trailing spaces might result in the value appearing in base-64 encoding (such as 34xy57eg).
If the attribute value ends with a trailing space, the trailing space is encoded as part of the attribute value. When you verify the change using DSCC or the ldapsearch command, the value you see might be plain text, but it might also appear as base-64 encoded text. This depends on which Directory Server client you use.