toad options - search trim - there is an option to trim trial blanks - bet one has it set and one does not. Always do a search in options for all such questions - easy, fast and usually finds the answer real quick
It’s supposed to apply to CHAR and NCHAR only since those datatypes automatically pad out to their length. VARCHAR2 doesn’t do that, so we assume that if you have trailing spaces in a VARCHAR2 column, you want them to be there. It sounds like it was a bug in Toad 10.6