Reference information not showing up in correct columns in Endnote

I tried to import references from a folder on my USB stick (all PDFs), but the information shows up in Endnote as, for example, <Carrier & Monk (2000).PDF>. in the title column and no other information (aside from reference type and last updated) shows up. Does anyone know what is going on? By the way, this happened for about 96 of my 128 references. Thanks for any help.