field title and field nid returns same result

• I created a custom content type "research_question" which has a normal title
• I created another custom content type "research_blog" which has an automatic nodetitle. This content type has a cck field "field_research_question", which references nodes of type "research_question".
• In "research blog", I set the token [field_research_question-title] as the pattern for the title. As a test I created a content of this type, and chose a pre-created node for the field "field_research_question". From the dropdown for this field I can see something like "Week 1: Research Question", which is the title of a pre-created node of type "research_question". After adding this node, I expected the title will be "Week 1: Research Question", but it turned out to be 173, which is the nid of the aforesaid node.
• I tested this by using "[field_research_question-title], [field_research_question-nid]" as the pattern for the title for the content type "research_blog". Then added a node of this type as per my previous test. True enough the title of this new node was "173, 173".

It is hence my belief that there is a bug here. That is, the title token returns the node id instead of the node title.