If you entered "Vixur marisel" it would be declined for not having a capital letter in the second name.
It is possible for the generator to produce invalid handles for one reason or another, but if it happens repeatedly with many generator-suggested handles, there may be a problem with the filter. I would suggest trying again with various handles, and letting us know what the results are. Be sure to mention the handles that it is rejecting.
I dare you to make less sense.
Are you a newbie, or do you have access to newbies?