Node title is only taking the first token value when using node_import

I am using node_import to create nodes from a csv file. I have set Nodetitles to use a token that is a cck integer [field_mbno-formatted].

When I run the node_import it correctly assigns the first value of field_mbno to the title but on all the subsequent nodes it uses this same value rather than using the new values of field_mbno. This gives all the imported nodes the same title.

In the call to Nodetitles from node_import does a variable or array need to be cleared for it to pick up the new value or could it be a problem with the token values being passed?