When multiple documents are imported at once in a project with multiple target languages, the sets of jobs (each set being created from the same source file) are sorted alphabetically, but within the sets (where job/file name is the same), the jobs are not sorted; they are ordered randomly.
Available workaround (if any):
Filtering jobs by File name, and sorting the results by Target.
Jobs created from the same source file for multiple target languages should be further ordered by their respective target language codes, in the same order as the target language codes are listed in sequence in the project header's Target languages section.
It would be easier to develop a UI handling routine with a job list that is ordered consistently by default.