endnote inserting bibliography in two fonts!

Hi, my bibliography has 10 references. I have set the format to Arial size 11. However, when the list is generated, entry #6 comes in times new roman. The other 9 are in Arial. I have unformatted and inserted again but the same issue resurfaced. This is mind-boggling. Has anyone else encounted this before or have any tips? 

Thanks, 

John.