No- I don’t think reinstalling Endnote will help.
Unfortunately, the fix when these get truncated is to unformat what you can, unlink fields on the rest, and replace them. In one case, the corruption resulted, as far as we could surmise, from putting the insert citation, inside an existing citation rather than after/outside the citation. In another case, I couldn’t replicate the problem at all, but it was obvious the user could.
Loptry had found and emailed me this (after I wasn’t much help to solving their problem) – the solution here, isn’t much of a solution though:
Subject: Re: hello, the doc for the thread “The chaos of output order”
Hello, Just FYI, I searched this web page: http://www.biomedcentral.com/info/ifora/endnote#grouptrunc The page side:
There are a group of citations within this highlighted section.
The main reason that a group of references become ‘truncated’ is that the field code cannot handle the large volume of information that is inserted at this point. The software automatically triggers the truncation to avoid the program crashing.
One quick solution to this issue is to select and insert each reference individually.
If you choose to do this, please ensure that you move your cursor to a position out-with the grey ‘highlighted’ field code.
(Ensure that your settings are correct to view the shading. To change to the correct setting please go to Tools> Options> View and select field shading ‘when selected’)
e.g. This text is an example of how to insert citations  [Insert next citation here] individually to avoid truncation.
This will result in the citations appearing as  etc.
We will correct the aesthetics of the citations for the final production.
Please check when inserting these citations that the field code for each is not truncated.
I don’t know if the page is Official approved. But at least it’s describe is similar to mine. and they(Then, they should be the EndNote Team?) say they will fix this problem(the field code cannot handle the large volume of information).