some references shifting up one

hi

i am stressed and nearing the end of a thesis.

limited skills with endnote and computers in general.

in melbourne australia, dont know if there is endnote support here

using mac and endnote X7.5.3

I have noticed the references in one part of the thesis have shifted up one. 

how has this happened. it has happened to this section of the document before and i had to manually move things.

Is there an easier way??

thanks for your advice

eva