Authors re-sorted when updated

Dear users of the plugin,

after having some start issues I got it to run with the help of the developer and am glad about its results.

Only issue I am having with it is, that if one manually updates or adds works to the data base, the plugin shuffels the authors seemingly at random. If I click update book/article/conference multiple times, it re-sorts the authors list every time for no real reason.
Also, if one tries to add a work manually with the authors in the correct order and updates/creates the entry, the authors are shown in another order.
Has anybody else experienced this so far?