Spinfile roam blank characters in the field of connection

For the first time, I'm using spintax in the "Login" field rather than "randomize". The reason is that I want everything to look British. I have special lists of first and last names, a short address.dat, and I double and triple check files.

There are two strange things that I just can not understand:

1. The last name in "Login" is different from all other fields (as if I had used spinfile2, but that is not the case.
2. From time to time, blank characters appear before the last name.

Here are my settings:
and here are two tests, as you can see, the white appears with some last names, not with others